tag:blogger.com,1999:blog-5101951813423833142024-03-05T21:26:25.017-08:00The Photographs I Findglimpses of photographic history and technologyGawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-510195181342383314.post-28366060234998596812014-01-07T15:22:00.000-08:002014-01-07T15:22:14.646-08:00Comparison Chart of Historical Film & Plate Speed Systems<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2vd3ekytK8Jdg4BR6KQ7LnMj6MSGw85RZYMwMg7IYQNFij-SANE1sS5-ppP7N8iQGRqs-A5J61cTxYHkx4lbtp01ntjVXnQYs6THVYIcwMrpXAXKHb7WPgOLYmgwI82BeEZaNBLFMz2X4/s1600/Comparison+Chart+of+Historical+Film+and+Plate+Speed+Systems.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2vd3ekytK8Jdg4BR6KQ7LnMj6MSGw85RZYMwMg7IYQNFij-SANE1sS5-ppP7N8iQGRqs-A5J61cTxYHkx4lbtp01ntjVXnQYs6THVYIcwMrpXAXKHb7WPgOLYmgwI82BeEZaNBLFMz2X4/s1600/Comparison+Chart+of+Historical+Film+and+Plate+Speed+Systems.jpg" height="223" width="320" /></a></div>
<br />Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-28190657609358443992013-03-25T12:39:00.003-07:002013-03-25T12:39:43.435-07:00Treatment of Deteriorated Cellulose Acetate Negatives
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<i>VINEGAR SYNDROME. Before and After Treatment of a 4”x5”
cellulose acetatenegative by stripping the image pellicle from the deteriorated
acetate support.</i></div>
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When photographic film with a cellulose acetate support
begins to deteriorate we say it has vinegar syndrome because it forms acetic
acid (among other deterioration byproducts) and smells like vinegar. The
acetate support also shrinks and becomes brittle eventually pulling away from
the gelatin image layer in patterns often called channeling. The plasticizer in
the acetate support comes to the surface and forms small bubbles between the
acetate support and the gelatin image layer. With all this deterioration and
deformation it becomes impossible to print or scan the negative and get a good
quality result. Cold storage is the only way to slow down this deterioration
process, but it can’t reverse deterioration that has already occurred. So for
some negatives it is necessary to separate the very thin gelatin image layer
from the deteriorating support. This technique of “emulsion stripping” was
first pioneered in Canada in the 1960s as a photomechanical layout technique
for combining graphic elements in the creation of camera ready art for
printing. It was adopted in the United States also for graphic arts purposes in
the 1970s and by the 1980s was being used for the first time as a conservation
method for deteriorated acetate negatives. It turns out that even after all the
dramatic deterioration of the acetate film base, the gelatin image layer is
usually still OK, and can be separated, scanned, and then stored safely. The
new digital image file can then be written back to a new sheet of
polyester-base film or stored in a digital repository. Gawain Weaver Art
Conservation has been performing this process for several years. Please contact
us to discuss your project.</div>
Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com2tag:blogger.com,1999:blog-510195181342383314.post-283975979696642472012-09-14T17:26:00.000-07:002012-09-15T13:24:15.988-07:00Chromogenic Print Fading at Seal Rocks<div class="separator" style="clear: both; text-align: center;">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgO-ws6R6dx-5DQdd47JTM_yG0TnfUcVdM7-XM84TzPbcqujtYVBcY__D74JPjNk-FZ9z1cGOzt38dW8_5wmkiyAqS7nsi0MN8gyQVpf66MysNOCyztM45q3JUFxJ3xiK4Re7Xup0VdaTJR/s1600/Chromogenic-print_Seal-Rocks_faded_01_web.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="313" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgO-ws6R6dx-5DQdd47JTM_yG0TnfUcVdM7-XM84TzPbcqujtYVBcY__D74JPjNk-FZ9z1cGOzt38dW8_5wmkiyAqS7nsi0MN8gyQVpf66MysNOCyztM45q3JUFxJ3xiK4Re7Xup0VdaTJR/s400/Chromogenic-print_Seal-Rocks_faded_01_web.jpg" width="400" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPDlyN5FQKBm9jdTJPJUuHbgenJF-nMA2sCMfZ04_nBcFdwv9AJjKTw2bCPW7uZooxH9xqqMFtQbYp8u7BIJciD7dRb523Q3viA6pTE4H8GT14GEIFaDw5bBgBblIQJhDElNk38bfrT-OV/s1600/Chromogenic-print_Seal-Rocks_faded_05_web.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="318" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPDlyN5FQKBm9jdTJPJUuHbgenJF-nMA2sCMfZ04_nBcFdwv9AJjKTw2bCPW7uZooxH9xqqMFtQbYp8u7BIJciD7dRb523Q3viA6pTE4H8GT14GEIFaDw5bBgBblIQJhDElNk38bfrT-OV/s400/Chromogenic-print_Seal-Rocks_faded_05_web.jpg" width="400" /></a></div>
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This 8"x10" resin-coated chromogenic print from the early 1970s hung in the owner's living room for several decades. Light exposure was limited to the area of the print within the window mat opening. When the mat was lifted, the difference between thermal fading and light fading over the last 40 years was revealed.</div>
<br />Elainehttp://www.blogger.com/profile/15682115382265775674noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-88357327359422266152011-10-31T10:38:00.000-07:002011-10-31T10:41:01.733-07:00The ghostly effects of platinum images<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDMDFSzMciZFFkJM4K_iXoW_Qe1AULHUQgqIzkDonvkYUGIRVR5__INFCPokllc-5vWsO09jgUnQ21WIu3j_mHt_-YepwmICQONtP9e4JGnpFELdPawzmy7D3I8Bo_kVQNaxlEpBnPKS3G/s1600/platinum+print_image+transfer_01.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="149" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDMDFSzMciZFFkJM4K_iXoW_Qe1AULHUQgqIzkDonvkYUGIRVR5__INFCPokllc-5vWsO09jgUnQ21WIu3j_mHt_-YepwmICQONtP9e4JGnpFELdPawzmy7D3I8Bo_kVQNaxlEpBnPKS3G/s320/platinum+print_image+transfer_01.jpg" width="320" /></a></div><br />
I recently found this platinum print, nearly panoramic by virtue of being two separate prints attached at the center. It's a platinum print of the sepia variety and what made it interesting to me was the dramatic image transfer effects that occurred as a result of being stored folded. Each half of the image has "transferred" itself on to the other half. For example, the two women standing in the flower garden on the right side also appear as ghosts in the road on the left side. Both of the buildings have also transferred their mirror images to the opposing side. The best explanation for this image transfer effect has been posited by Mike Ware. His theory goes something like this: the platinum image metal plays a key role in the conversion of sulfur dioxide (an air pollutant) into sulfuric acid, which causes the brown discoloration of the paper. We often see this effect on paper folders and protective tissues in contact with platinum prints and also on paper materials in contact with matte collodion prints (which are toned with platinum).Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-52857205853077313392011-08-03T14:55:00.000-07:002011-08-03T14:55:22.950-07:00Kodak Notch Codes in the 1970sAlthough I'm planning a much larger article on notch codes and the decoding of other information on (mostly Kodak) films and prints, here are a few notch codes for (mostly) 1970s color material that might be useful to some. All images are from different editions of the Kodak Color Dataguide:<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpZLhyphenhyphenrSM9Mf0A2gXjhuoMdQAiVBc8JTLusCwZtoyxXIfrNlkct9gbCAlns3NxlbGoww_q2VScH2oKSiOHcjcgAacwyWIgUZG0LlhEqSKBdJAeYhg0iVtNlHhGQwTYf27J3bxRKeK0usTZ/s1600/Kodak+Color+Dataguide.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpZLhyphenhyphenrSM9Mf0A2gXjhuoMdQAiVBc8JTLusCwZtoyxXIfrNlkct9gbCAlns3NxlbGoww_q2VScH2oKSiOHcjcgAacwyWIgUZG0LlhEqSKBdJAeYhg0iVtNlHhGQwTYf27J3bxRKeK0usTZ/s200/Kodak+Color+Dataguide.jpg" width="129" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide</td><td class="tr-caption" style="text-align: center;"><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5bFikpDwH3DH6WpFpYGNxUp4xTSU2dsIjutzUoCOmhsymgYHLEc9p8QzxhafbQ4D1pp3BgqXVB3Pwa81uRwj_X4qA0AuH5xzbx9SMMMobei1Cy0tPw5Hlm73QnOekGHzbyzfQa08a2kmM/s1600/Kodak+Color+Dataguide_1966.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5bFikpDwH3DH6WpFpYGNxUp4xTSU2dsIjutzUoCOmhsymgYHLEc9p8QzxhafbQ4D1pp3BgqXVB3Pwa81uRwj_X4qA0AuH5xzbx9SMMMobei1Cy0tPw5Hlm73QnOekGHzbyzfQa08a2kmM/s200/Kodak+Color+Dataguide_1966.jpg" width="136" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1966</td><td class="tr-caption" style="text-align: center;"><br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBnCOKv3W4moig7B05jwcloWPb1EbBE8EZHv8Q6Pe8fsJXJB73M8b1E25NF1pd9O7_cxn7JVQ4OGoUjhFRTbrv5C-RlGYsglkai2ekIWnApcX5Vo-7HFQ-Rm4BQemtGPJi61X0aaiamkCf/s1600/Kodak+Color+Dataguide_1971.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBnCOKv3W4moig7B05jwcloWPb1EbBE8EZHv8Q6Pe8fsJXJB73M8b1E25NF1pd9O7_cxn7JVQ4OGoUjhFRTbrv5C-RlGYsglkai2ekIWnApcX5Vo-7HFQ-Rm4BQemtGPJi61X0aaiamkCf/s200/Kodak+Color+Dataguide_1971.jpg" width="153" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1971</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_XnOBjXtWJn_lHB8wFAIK6AG1liOkSNH_S5a8a_D4xx-55QxK0K1ZOcHOiMQ8OLbagc1ruxQoRAMN5oaOuC9W51KXfnUOCnUml9phIuR9C4EiLHq4j8rPFhFCXdbDyYFNo_oqZ3yXQXEQ/s1600/Kodak+Color+Dataguide_1974.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_XnOBjXtWJn_lHB8wFAIK6AG1liOkSNH_S5a8a_D4xx-55QxK0K1ZOcHOiMQ8OLbagc1ruxQoRAMN5oaOuC9W51KXfnUOCnUml9phIuR9C4EiLHq4j8rPFhFCXdbDyYFNo_oqZ3yXQXEQ/s200/Kodak+Color+Dataguide_1974.jpg" width="136" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1974</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZe1U1tQZVes5l26Mugp_iXpPyDJAmgH26lca_Dk8L-xymOxCbojxc5URL1Fz1IR-ddik89HwMWM6IHjQTusPalxFLPVASfQnLfQf578cAj59QG_PJmUG1BQV3C69kOOW0-WyenGmcqtra/s1600/Kodak+Color+Dataguide_1975.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZe1U1tQZVes5l26Mugp_iXpPyDJAmgH26lca_Dk8L-xymOxCbojxc5URL1Fz1IR-ddik89HwMWM6IHjQTusPalxFLPVASfQnLfQf578cAj59QG_PJmUG1BQV3C69kOOW0-WyenGmcqtra/s200/Kodak+Color+Dataguide_1975.jpg" width="116" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1975</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0jBIcRS48OfgonV_MdVHu1BT_UqhE6xovdSJQZGHwTdAcbzNTxbJEITBnzdbeTPoEXnnfZA8EnqBQ6na2-6BXsFXntnMHLen-7xpaON1lvqXdSSjHZFMQzv4VrrFWEHWwBgzRBeqNzOJ6/s1600/Kodak+Color+Dataguide_1976.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0jBIcRS48OfgonV_MdVHu1BT_UqhE6xovdSJQZGHwTdAcbzNTxbJEITBnzdbeTPoEXnnfZA8EnqBQ6na2-6BXsFXntnMHLen-7xpaON1lvqXdSSjHZFMQzv4VrrFWEHWwBgzRBeqNzOJ6/s200/Kodak+Color+Dataguide_1976.jpg" width="153" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1976</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicQ23OE2JdIiI780jdKKMR4tDmCZAczoBQQMSvAdVo03dXjIMesw3W3beyClplEMA83O2rX4KMRFKsg64T3F5toX2uZ4MazJhsTYyOtiMkHWDSUrFyeSrw3piLAvogeSECuZVkDYcPynbc/s1600/Kodak+Color+Dataguide_1977+supplement.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="121" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicQ23OE2JdIiI780jdKKMR4tDmCZAczoBQQMSvAdVo03dXjIMesw3W3beyClplEMA83O2rX4KMRFKsg64T3F5toX2uZ4MazJhsTYyOtiMkHWDSUrFyeSrw3piLAvogeSECuZVkDYcPynbc/s200/Kodak+Color+Dataguide_1977+supplement.jpg" width="200" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1977 supplement</td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirvf3RRFLQyyHs4YdvZJbZqJPmtTrPBMLBaujzUfPjxn9lcBYBvdlgnc40lzjyUMfZkTEHsrWr9QUMOzP_T_orKSe_acwfgGXzURBe01uzS53cG_2uzGHfOAZsU3aF-oghp5Ad99Qy1eSp/s1600/Kodak+Color+Dataguide_1978.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirvf3RRFLQyyHs4YdvZJbZqJPmtTrPBMLBaujzUfPjxn9lcBYBvdlgnc40lzjyUMfZkTEHsrWr9QUMOzP_T_orKSe_acwfgGXzURBe01uzS53cG_2uzGHfOAZsU3aF-oghp5Ad99Qy1eSp/s200/Kodak+Color+Dataguide_1978.jpg" width="134" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Kodak Color Dataguide 1978</td></tr>
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<div class="separator" style="clear: both; text-align: center;"></div>Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-30531723674369058552010-12-08T23:48:00.000-08:002010-12-09T14:33:22.548-08:00Kodak Super-XX Film Pack<div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="" style="background-color: black; clear: both; color: white; text-align: center;">Following a discussion about pack film on the <a href="http://tech.groups.yahoo.com/group/PhotoHistory/">Photohistory listserv</a> I acquired an unopened Kodak Film Pack. The "Develop By" date on the package is March 1955. I will annotate and add further information, including pictures of developed film negatives at some point. But here are the pictures for a start:</div><div class="" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUionkkasUbu6ex8DRgQUdOiL_na6C3XCOb6_ajO5HspAm2xjVQ_rFucnYI_sk0yda4qykApsKWSors3Fm8NkMX-AXR8-5WelLWK5DWHW39ivtBDwRRp2Ok6afjEn3JhniRZBx7Ryhyow6/s1600/Kodak+Film+Pack_01.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUionkkasUbu6ex8DRgQUdOiL_na6C3XCOb6_ajO5HspAm2xjVQ_rFucnYI_sk0yda4qykApsKWSors3Fm8NkMX-AXR8-5WelLWK5DWHW39ivtBDwRRp2Ok6afjEn3JhniRZBx7Ryhyow6/s320/Kodak+Film+Pack_01.jpg" width="273" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjn33t_T0LEqYFk_czI3AlrwxPPLrqpch6SoREbkynYoCm6WsmuoUfY9iUAHYfhiRHpHsL_ykwOhWgzxH82_wAZeKm3Tj26V7gYMIXygiRVJOQDx5IF7TlIO9vMY0uGIMpU9CPLIUkP_qJh/s1600/Kodak+Film+Pack_02.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjn33t_T0LEqYFk_czI3AlrwxPPLrqpch6SoREbkynYoCm6WsmuoUfY9iUAHYfhiRHpHsL_ykwOhWgzxH82_wAZeKm3Tj26V7gYMIXygiRVJOQDx5IF7TlIO9vMY0uGIMpU9CPLIUkP_qJh/s320/Kodak+Film+Pack_02.jpg" width="273" /></a></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGgf7mMq4rULtkKpSS_kCTSgWswpFwEtRfnj0eIrdrbmEY3x6Bl_KgM2De9Xtyv7l8Mu37Ij764ZGF92pZJtF-b1JHCjjV__FhZXYKgmkbwrvUen81IAHmxPWMyRLQk13klk04U6K2INV7/s1600/Kodak+Film+Pack_07.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGgf7mMq4rULtkKpSS_kCTSgWswpFwEtRfnj0eIrdrbmEY3x6Bl_KgM2De9Xtyv7l8Mu37Ij764ZGF92pZJtF-b1JHCjjV__FhZXYKgmkbwrvUen81IAHmxPWMyRLQk13klk04U6K2INV7/s320/Kodak+Film+Pack_07.jpg" width="273" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyLEbExQpdj8m7qFyy7ksAm2B-_2iLNPlitBePikFxhKbIMcpZcMKIMexM4Hjcrrx7LivcldVRTHWM1gLVkkZ-XloirUQLq2xWa2vKS8yIEASlLOfxnhsAsYWPkORoNAv-YGGeaIN-DhTf/s1600/Kodak+Film+Pack_08.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyLEbExQpdj8m7qFyy7ksAm2B-_2iLNPlitBePikFxhKbIMcpZcMKIMexM4Hjcrrx7LivcldVRTHWM1gLVkkZ-XloirUQLq2xWa2vKS8yIEASlLOfxnhsAsYWPkORoNAv-YGGeaIN-DhTf/s320/Kodak+Film+Pack_08.jpg" width="213" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoRndYvXiTjmGa1jaXj6zf7kMKkF9RFL0aCa07toWvtrmsKJU-UHxmJtGUyxsqzFK_I6YBkmYdG_55b7Sx0UPDJY1yqZtyH_FS82A7PD29bAOsEi26DoDlouKAy0ldMcA5xO8evYJ3J2wY/s1600/Kodak+Film+Pack_09.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoRndYvXiTjmGa1jaXj6zf7kMKkF9RFL0aCa07toWvtrmsKJU-UHxmJtGUyxsqzFK_I6YBkmYdG_55b7Sx0UPDJY1yqZtyH_FS82A7PD29bAOsEi26DoDlouKAy0ldMcA5xO8evYJ3J2wY/s320/Kodak+Film+Pack_09.jpg" width="213" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZF_ilWGhtvPtFhWukedZo9-4fvKgWo-YD0W7Z4q7tflRA9ALiBpqrYeoz7PSWZ-W1YU5I3-pVUPlcSGjU5QU70_gaR9Nt7It8YITC9t8ZzDSOuSIVCLo7njbW7zcsulv4lIFlcHgtbJ1p/s1600/Kodak+Film+Pack_10.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZF_ilWGhtvPtFhWukedZo9-4fvKgWo-YD0W7Z4q7tflRA9ALiBpqrYeoz7PSWZ-W1YU5I3-pVUPlcSGjU5QU70_gaR9Nt7It8YITC9t8ZzDSOuSIVCLo7njbW7zcsulv4lIFlcHgtbJ1p/s320/Kodak+Film+Pack_10.jpg" width="213" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrozoZjOIaahN9z-HeCQCGb2DQaPaSGXp3XX8mNS5WW-W0ZmccBx6s8qKrXdVNRnY-mOifl69cULf4X4zSINRf9qatfLCcGh2UJWhV5HKHmYox5qBMGodpIdXdnIUVwLNbuPyLPkPN9syH/s1600/Kodak+Film+Pack_11.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrozoZjOIaahN9z-HeCQCGb2DQaPaSGXp3XX8mNS5WW-W0ZmccBx6s8qKrXdVNRnY-mOifl69cULf4X4zSINRf9qatfLCcGh2UJWhV5HKHmYox5qBMGodpIdXdnIUVwLNbuPyLPkPN9syH/s320/Kodak+Film+Pack_11.jpg" width="213" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjU-r-tMC8x18yxNEk9XcJAc2E3212_JPj63SRwVjzYZWwMJid696ocLsybLJR9rvrV87aWD8vrm93En98m6_X04yeqP5fg-1_-wGDaGJ1CKVAx6WNFodMcDInMDoeNm6fpdF51MSr1V9QX/s1600/Kodak+Film+Pack_12.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjU-r-tMC8x18yxNEk9XcJAc2E3212_JPj63SRwVjzYZWwMJid696ocLsybLJR9rvrV87aWD8vrm93En98m6_X04yeqP5fg-1_-wGDaGJ1CKVAx6WNFodMcDInMDoeNm6fpdF51MSr1V9QX/s320/Kodak+Film+Pack_12.jpg" width="213" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCarA_NKLdHwj1odWTKweugZhmTebizKo5FvYBy8pAt1gB-DAcvn4TOM-chLE7QrNASVJQzt3vuu5DF3DH3xo9dYT6uMl3FVw9p6q24LyNPQRBCNzOoEYC9gzpGZYWSChqdH_LJhT9EQYR/s1600/Kodak+Film+Pack_15.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="134" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCarA_NKLdHwj1odWTKweugZhmTebizKo5FvYBy8pAt1gB-DAcvn4TOM-chLE7QrNASVJQzt3vuu5DF3DH3xo9dYT6uMl3FVw9p6q24LyNPQRBCNzOoEYC9gzpGZYWSChqdH_LJhT9EQYR/s320/Kodak+Film+Pack_15.jpg" width="320" /></a></div><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5tseyCvGFcdTG7uGgiaHJSI2EBsmMudaWczpPmJZqYK3_pFuLhPaZynNveYcpXTTZBL4PilwCDYdLUVtkiXZzSfoHgBDYk51sOrd7X79g4xpPK-CTlt5iEvofWikbLWfK_v3y_Y9tjc_2/s1600/Kodak+Film+Pack_20.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="179" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5tseyCvGFcdTG7uGgiaHJSI2EBsmMudaWczpPmJZqYK3_pFuLhPaZynNveYcpXTTZBL4PilwCDYdLUVtkiXZzSfoHgBDYk51sOrd7X79g4xpPK-CTlt5iEvofWikbLWfK_v3y_Y9tjc_2/s320/Kodak+Film+Pack_20.jpg" width="320" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4e0s4ZS4WALfOI2R7ssLLX_To0vLK04Afta-ZLGOAdRVGGAIQXbv9x6CfGWO72xUSkhJbabII2Zp5aaC1mrgfR3nDge61WIJMe9G8un-QuZf4AMZ5_4-FcHS98mtHxAw3J7m23PcrtJO5/s1600/Kodak+Film+Pack_03.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4e0s4ZS4WALfOI2R7ssLLX_To0vLK04Afta-ZLGOAdRVGGAIQXbv9x6CfGWO72xUSkhJbabII2Zp5aaC1mrgfR3nDge61WIJMe9G8un-QuZf4AMZ5_4-FcHS98mtHxAw3J7m23PcrtJO5/s320/Kodak+Film+Pack_03.jpg" width="161" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSt7OwojPOpL_zHuvwaI4SvGvk5nxS6Ypa_vIyvtcnx04rJ_Hac4JOH3NoWXE61lAshvAXTojU8VseHtvsuA7wip-XMue1u9WYxHY06eGlubbhPD2NSHeFEb_koxiMlShCeKcvaWUCCTCi/s1600/Kodak+Film+Pack_04.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSt7OwojPOpL_zHuvwaI4SvGvk5nxS6Ypa_vIyvtcnx04rJ_Hac4JOH3NoWXE61lAshvAXTojU8VseHtvsuA7wip-XMue1u9WYxHY06eGlubbhPD2NSHeFEb_koxiMlShCeKcvaWUCCTCi/s320/Kodak+Film+Pack_04.jpg" width="170" /></a></div><br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOr0D3L9weoPXOGLfx0sRvOA1Ad-pVIWz6SlT9L5tTICfv-uvM8XX0MmRq2prtojAuTo8LlSxlp7CMkqi-_389O-0n3MQT0POXTpB1Bc4xqmAUSxsPfniEmNeU4oIgz7A-kWcxyVDRtWr4/s1600/Kodak+Film+Pack_05.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOr0D3L9weoPXOGLfx0sRvOA1Ad-pVIWz6SlT9L5tTICfv-uvM8XX0MmRq2prtojAuTo8LlSxlp7CMkqi-_389O-0n3MQT0POXTpB1Bc4xqmAUSxsPfniEmNeU4oIgz7A-kWcxyVDRtWr4/s320/Kodak+Film+Pack_05.jpg" width="156" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYsw7I2cTF0UE8IUGSCWCm1lcl607c85p_kx_3VYWkuXri11gVwkoeSiWnjapMuRSSTIIncH9SDjsb2eFWIHqXtZEK0oTI7zPYCG7fUwYycR9qGba0b7dUh4CZR3ZWXjSoFmoBdWtE2F96/s1600/Kodak+Film+Pack_06.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYsw7I2cTF0UE8IUGSCWCm1lcl607c85p_kx_3VYWkuXri11gVwkoeSiWnjapMuRSSTIIncH9SDjsb2eFWIHqXtZEK0oTI7zPYCG7fUwYycR9qGba0b7dUh4CZR3ZWXjSoFmoBdWtE2F96/s320/Kodak+Film+Pack_06.jpg" width="170" /></a></div><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFGXGrmQ1PfKt7_nwYQ0kPw8pgwn8wUIWSLvPCr6ZnhjuJ9y6WrgigkyvUzf0fbkNk3Ybkej8lfiDnVfplsmhgZL2nzsodwZRidyClLv2xxIAPSfLjMp_ks9ZT_GN0IY4nDSLBH_ZSJ1lD/s1600/4x5+pack+film+negative.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="234" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFGXGrmQ1PfKt7_nwYQ0kPw8pgwn8wUIWSLvPCr6ZnhjuJ9y6WrgigkyvUzf0fbkNk3Ybkej8lfiDnVfplsmhgZL2nzsodwZRidyClLv2xxIAPSfLjMp_ks9ZT_GN0IY4nDSLBH_ZSJ1lD/s320/4x5+pack+film+negative.jpg" width="320" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="background-color: black; color: white;">A 4x5 pack film negative showing the adhesive attachment stain along the right edge, and the negative number exposed onto the negative in the lower left corner. The image is blurred and possibly out of focus. Some of the original adhesive is still present along the left edge, but even where the adhesive is absent a brown image or stain remains in the film. This could have been caused by a chemical reaction between the adhesive and the silver image or by the pressure involved in applying the adhesive tape during manufacture (pressure exposes silver halide emulsions).</span></td></tr>
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqWTO8furG82QoYH1tQ0jdJNFRmfNDwjLodSSnYHMqQGykBo_e4-mNVzMDcv6A2EgeKNoSFwGobQbxohv27_VgVcb-Kq7guvY4jhISrIIc5Ssji3R_g2cNNkt1HFQAI_6KtYiMBjtZwq49/s1600/Film+Pack+Diagram+Neblette+3rd+edition_1.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqWTO8furG82QoYH1tQ0jdJNFRmfNDwjLodSSnYHMqQGykBo_e4-mNVzMDcv6A2EgeKNoSFwGobQbxohv27_VgVcb-Kq7guvY4jhISrIIc5Ssji3R_g2cNNkt1HFQAI_6KtYiMBjtZwq49/s320/Film+Pack+Diagram+Neblette+3rd+edition_1.jpg" width="175" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Film Pack Diagram from C.B. Neblette, <i>Photography: Its Principles and Practice</i>, 3rd Edition (1938)</td></tr>
</tbody></table>Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com1tag:blogger.com,1999:blog-510195181342383314.post-35622592758083335952010-09-05T16:34:00.000-07:002010-09-06T13:34:04.150-07:00Boy Scout Jamboree: Dufaytissue from DufaycolorI recently acquired a few Dufaycolor transparencies and with them came a single print of a type I had never seen before. After a little research, the print appears to be a Dufaytissue (Dufay Tissue?), a modified version of the tricolor carbon process using carbon tissues on acetate supports for the individual color layers which are then assembled on a paper support. Although my example may not be typical, the Dufaytissue lacks detail in the highlights and shadows as well as sharpness compared to the original Dufaycolor transparency. This Dufaytissue image degradation is likely common given the difficulties inherent in making a continuous tone print from an additive screen plate with its color mosaic. Both images measure 6x9 cm.<br />
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<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3vIXHBDIrt-ez_jjrjVzNYweuYsE7ZtgsEVa3gzwxfRK6jufeFT0GgqxdYL6yuA1YDAIO-8ZahVMam84-2xPBVBCQWSn-JOdnHXcKrqA_hCxx__qDa7Zj8rUhLu6TArsm9DXg1_JfJ_I2/s1600/Boyscout+Jamboree+Dufaycolor.jpg" imageanchor="1" style="clear: left; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img border="0" height="261" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3vIXHBDIrt-ez_jjrjVzNYweuYsE7ZtgsEVa3gzwxfRK6jufeFT0GgqxdYL6yuA1YDAIO-8ZahVMam84-2xPBVBCQWSn-JOdnHXcKrqA_hCxx__qDa7Zj8rUhLu6TArsm9DXg1_JfJ_I2/s400/Boyscout+Jamboree+Dufaycolor.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Dufaycolor</td></tr>
</tbody></table><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="float: left; margin-right: 1em; text-align: left;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvpwm0E1SHyexbg1Fqpp9H_j_elUJobY0ILpJQKnbdWcve2GCmj6cxzl16_T061W3e_NaRViQQywlX8bXsLlS8kZtzGGcKFkN8G4R_JNrLvN6bldR_qwbLh3BjYdPm3KOuTXY9dPxeKsZk/s1600/Boyscout+Jamboree+Dufaytissue.jpg" imageanchor="1" style="clear: right; margin-bottom: 1em; margin-left: auto; margin-right: auto;"><img border="0" height="276" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvpwm0E1SHyexbg1Fqpp9H_j_elUJobY0ILpJQKnbdWcve2GCmj6cxzl16_T061W3e_NaRViQQywlX8bXsLlS8kZtzGGcKFkN8G4R_JNrLvN6bldR_qwbLh3BjYdPm3KOuTXY9dPxeKsZk/s400/Boyscout+Jamboree+Dufaytissue.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Dufaytissue</td><td class="tr-caption" style="text-align: center;"></td></tr>
</tbody></table>Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-12117570678603113232010-07-18T13:50:00.000-07:002010-07-18T13:50:59.983-07:00Candlestick Antiques / Flea MarketThe <a href="http://www.candlestickantiques.com/">Candlestick Park Antiques & Collectibles Faire</a> opened today in the parking lot of San Francisco's Candlestick Park, home of the San Francisco 49ers. July 18, 2010 was the opening day for this new San Francisco flea market, and a welcome addition to the Bay Area's flea market scene. The <a href="http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/07/17/MNDR1EEVEA.DTL">SF Chronicle</a> had a nice article on them yesterday, and if all goes well they'll be happening the third Sunday of every month. I went to this inaugural day to see what photographic treasures might be found, and I was not disappointed.<br />
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I found 3 photolithographs (also called Photochroms) made by the Detroit Publishing Co. of Detroit's Belle Isle park. <a href="http://loc.gov/pictures/collection/pgz/">The Library of Congress</a> has some info on them, and the <a href="http://en.wikipedia.org/wiki/Photochrom">Wikipedia entry on Photochrom</a> is another good resource. Photolithographs are a rather unusual process, and I have not found many of them in my years of antiquing. Here's two of the prints that I found:<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiI4hiTFAjXd5tlV18fQZJd9xdSIgPJMRijF6TtaEXuphvC6MWfb1QFPvF2lB91U5ZAEp0g2YLIPxIdkbBLJMcMKFoqwZ1a6ypf0jijacr_0RxspFnsk2SStNWhFnDTGHe-5WyuAzZhq_m/s1600/Detroit+photolithographs_01.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiI4hiTFAjXd5tlV18fQZJd9xdSIgPJMRijF6TtaEXuphvC6MWfb1QFPvF2lB91U5ZAEp0g2YLIPxIdkbBLJMcMKFoqwZ1a6ypf0jijacr_0RxspFnsk2SStNWhFnDTGHe-5WyuAzZhq_m/s320/Detroit+photolithographs_01.jpg" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCAtLkFJF0JIdkl3N_bJHiSn9onzEuyxPQbOcHX2eKRVhe2mMRflhNZpWdXnLxOo6wsmZk2ADBWVO7H_xFelxuVuewne7LR8TL7RLnJ2DLAH5MMB_6yVGr3YJR-qa0Gq5onZCpVwCJmepw/s1600/Detroit+photolithographs_02.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCAtLkFJF0JIdkl3N_bJHiSn9onzEuyxPQbOcHX2eKRVhe2mMRflhNZpWdXnLxOo6wsmZk2ADBWVO7H_xFelxuVuewne7LR8TL7RLnJ2DLAH5MMB_6yVGr3YJR-qa0Gq5onZCpVwCJmepw/s320/Detroit+photolithographs_02.jpg" /></a></div><br />
And here's what they look like under magnification!<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiX2UcJKBccf9sUMhZdp-3wN07Y7BLA3xXMPjgmZSXJtn2twAFUZQT0ILY9EJPeD-dVH67fFPh8Fa332TD3xSyRGVvd3T_7QnUou2WgAzrKB4_pLAp5CQxG9nfW_Iouv8BjXrDD590sSvkM/s1600/PhotoLithograph_surface_45_micro6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiX2UcJKBccf9sUMhZdp-3wN07Y7BLA3xXMPjgmZSXJtn2twAFUZQT0ILY9EJPeD-dVH67fFPh8Fa332TD3xSyRGVvd3T_7QnUou2WgAzrKB4_pLAp5CQxG9nfW_Iouv8BjXrDD590sSvkM/s320/PhotoLithograph_surface_45_micro6.jpg" /></a></div><br />
I also found a nice overpainted salt print<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEfclhrxTMHO0LnM1FYRP5PpwUM9V_uX3qHJJImY4Yk-PcRg6lM7aTAfbMfBLRpPPgFm3LKtvzWFBIyr33WiMTjjp36YsWjQ_7Klx_0SSUzBS1D_0iGrTc_otMEyk5_HIYSPE0qdW8lkeW/s1600/overpainted+salt+print-Candlestick+Flea+Market+July+2010.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEfclhrxTMHO0LnM1FYRP5PpwUM9V_uX3qHJJImY4Yk-PcRg6lM7aTAfbMfBLRpPPgFm3LKtvzWFBIyr33WiMTjjp36YsWjQ_7Klx_0SSUzBS1D_0iGrTc_otMEyk5_HIYSPE0qdW8lkeW/s320/overpainted+salt+print-Candlestick+Flea+Market+July+2010.jpg" /></a></div><br />
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And a nice example of image transfer on a matte collodion print, the result of the catalytic action of the platinum in the image which converts sulfur dioxide into sulfuric acid and turns the paper brown where it is in contact with the image (at least that's my current understanding!):<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-tmapPvD5pNfQWvvTSgZNuZvSkwDOKdDh7PosaykCNPJIMgcGuji1ZheHZjsxv6fO80XGFcgScORggTRzpANcul3PYsy1vK1_GOptLNbIF3IuFhay9mKgdovbXIcG3k33hTTfEzvJubXg/s1600/matte+collodion+with+image+transfer.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-tmapPvD5pNfQWvvTSgZNuZvSkwDOKdDh7PosaykCNPJIMgcGuji1ZheHZjsxv6fO80XGFcgScORggTRzpANcul3PYsy1vK1_GOptLNbIF3IuFhay9mKgdovbXIcG3k33hTTfEzvJubXg/s320/matte+collodion+with+image+transfer.jpg" /></a></div><br />
<div class="separator" style="clear: both; text-align: center;"></div><div class="separator" style="clear: both; text-align: center;"></div>Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-10653898005051278462009-11-25T19:23:00.000-08:002009-11-27T01:24:34.606-08:00No carbon, but still potatoes...<div class="separator" style="clear: both; text-align: center;"><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEil92QtOj6jUYKMsdxj4XMhMaseKEbmtvF4GerHYW8qBHpQhZON_Klew1Fnt1YDQYNqlF-iIihRkz3HNNfH4mxoewKM0F8flmezIE0fEaoTOqGT_umyk49ql0rZgdudb-R46YmYcnaG-txQ/s1600/Alticolor_500x_scale.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEil92QtOj6jUYKMsdxj4XMhMaseKEbmtvF4GerHYW8qBHpQhZON_Klew1Fnt1YDQYNqlF-iIihRkz3HNNfH4mxoewKM0F8flmezIE0fEaoTOqGT_umyk49ql0rZgdudb-R46YmYcnaG-txQ/s320/Alticolor_500x_scale.jpg" /></a><br />
</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwpAm71sW_Gn5DmIsl4QHgIwgnlCxJ2yUpkyzXuI4UzrkTbRHG0q3vhKjHSuRbpgP_eu4pwhjWwrpzB0HHA89cMx7aA97RjpUQA6WH4YwT6yqdFGlfrBizMO-6wPEJ_umz8Zl830KsEbUL/s1600/Alticolor_500x_cross-polarized.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwpAm71sW_Gn5DmIsl4QHgIwgnlCxJ2yUpkyzXuI4UzrkTbRHG0q3vhKjHSuRbpgP_eu4pwhjWwrpzB0HHA89cMx7aA97RjpUQA6WH4YwT6yqdFGlfrBizMO-6wPEJ_umz8Zl830KsEbUL/s320/Alticolor_500x_cross-polarized.jpg" /></a><br />
</div>...well, some kind of starch anyways. Thanks to my collaborator-in-all-things-color Zach Long at the Image Permanence Institute, I can now show you photomicrographs of the <a href="http://silversolvent.blogspot.com/2009/11/alticolor-autochrome-of-1950s.html">Alticolor film</a> with an expiration date of July 1956 that I recently acquired. Given the date, this is from one of the last batches of the last form of the screen process originally introduced as the Autochrome in 1907. <a href="http://silversolvent.blogspot.com/2009/11/alticolor-autochrome-of-1950s.html">As I mentioned before</a>, I have heard rumors that, at some point, carbon black was no longer used in the manufacture of the Lumiere additive screen processes, and that yeast grains replaced potato starch grains. Well, this Alticolor film does NOT use carbon black to fill the interstices between the grains (see upper image), but it DOES still use starch grains (as evidenced by the Maltese cross in each grain under cross polars-- see lower image). While it would be nice to have a more complete picture of how the various "Autochrome" products changed over time, this will have to do for today...Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com0tag:blogger.com,1999:blog-510195181342383314.post-4786523158359703232009-11-17T19:02:00.000-08:002009-11-17T19:16:12.877-08:00Dufaycolor<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKuBRtwHEMJYm4VNxQptud9VhhjrWVXXIfYuAm_NOjQ3hBjCtyZ3a7bmPP8MXYTMqUhsv7bXbUBHkxJHiIW8f3ur48YA4KdKFths79kFPIj9MOeF832wtjw0w-Cw_0Uzo_FLqMskj1uEQM/s1600/Dufay+sailboat+500x.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKuBRtwHEMJYm4VNxQptud9VhhjrWVXXIfYuAm_NOjQ3hBjCtyZ3a7bmPP8MXYTMqUhsv7bXbUBHkxJHiIW8f3ur48YA4KdKFths79kFPIj9MOeF832wtjw0w-Cw_0Uzo_FLqMskj1uEQM/s200/Dufay+sailboat+500x.jpg" /></a><br />
</div><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZAouHr_iqSeNbej2FtA3iHnH4qVxqllmmC0SvZXzLLfbD5uav8_PDGDJ62efLPauDYDRLTOR1_-gVpcdW663X1U6Yy3_gykSo47-X0pQqqSBTjCfXTHiSEUcaV1-azn4jTxJOXNMOzikq/s1600/Dufay+sailboat.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZAouHr_iqSeNbej2FtA3iHnH4qVxqllmmC0SvZXzLLfbD5uav8_PDGDJ62efLPauDYDRLTOR1_-gVpcdW663X1U6Yy3_gykSo47-X0pQqqSBTjCfXTHiSEUcaV1-azn4jTxJOXNMOzikq/s200/Dufay+sailboat.jpg" /></a><br />
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The last significant additive screen process to be introduced was a modification of the original Dufay dioptichrome process from before WWI. First released as a motion picture film in 1932, it was introduced for still photography in 1935 in roll, sheet, and film pack forms. A very fine screen structure, increased sensitivity, and simple reversal processing kept it in use into the 1950s for still photography.<br />
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhAoaaQwFnPKgpJHmt7QrRPrt0sHFmnSgph0mzV0NUcXq7dCj6N_wSkaql_Eg0z5_rBjooWgLKS7h01hihfksm1ykzDKoBqyQH3U3SMGw5FSzvGaVyNpxsluud9_QTUPEp5VTGLHLWklPb7/s1600/GEH+Dufaycolor+film+strip_magnified.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLcadE0H2OhYMUATQrtJIXw9OKlc97EcKCMakfeMSGgHHytWw7JTwsPWCjL4jy2s_8lCC8fBwORCoSHfc8yGDvh-mb4y53rzF_gwnjBZYykXFg2fRUeb4CAPV1meUffyUPbKdE7_crGTLi/s1600/GEH+Dufaycolor+film+strip.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiLcadE0H2OhYMUATQrtJIXw9OKlc97EcKCMakfeMSGgHHytWw7JTwsPWCjL4jy2s_8lCC8fBwORCoSHfc8yGDvh-mb4y53rzF_gwnjBZYykXFg2fRUeb4CAPV1meUffyUPbKdE7_crGTLi/s200/GEH+Dufaycolor+film+strip.jpg" /></a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_pwG9wQZr9fuip7Qzaj_FaNHLZl9FEKh6SeqLwQNrCYqXZ4j-t2cgrYzK_0KvAhUFWwak6xyQrGUSh06nN8KgOtqvSZQOioU1Rf19bLuKcCgTyuaUI9JVdmiVhtZB6xFs_4EsOod5-Y4K/s1600/GEH+Dufaycolor+film+strip_magnified.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_pwG9wQZr9fuip7Qzaj_FaNHLZl9FEKh6SeqLwQNrCYqXZ4j-t2cgrYzK_0KvAhUFWwak6xyQrGUSh06nN8KgOtqvSZQOioU1Rf19bLuKcCgTyuaUI9JVdmiVhtZB6xFs_4EsOod5-Y4K/s320/GEH+Dufaycolor+film+strip_magnified.jpg" /></a>Its use in motion pictures was short lived, though long enough to produce a number of feature-length films in the 1930s. Although not present on this sample from the Eastman House Film Technology Collection, a variable density soundtrack could be printed successfully into the image area.Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com3tag:blogger.com,1999:blog-510195181342383314.post-84668253824140468902009-11-02T19:09:00.000-08:002009-11-03T00:15:22.752-08:00Alticolor, the Autochrome of the 1950s<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxyhTmxdCvsRf4I6FRC6oz4eU5S7L8sm_u-wnq9YaMzXYrBV2n2NQmEQLB0aHyzQdxglmZVZOPcV9dddSK9epBn7PjPmU_zIm3_TP2dp43HiJUDwnWOr4KV3uM6_BFhHodeo-pGFDMiO3P/s1600-h/alticolor_02.jpg"><img style="margin: 10pt 10px 10px 0pt; float: left; cursor: pointer; width: 130px; height: 320px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxyhTmxdCvsRf4I6FRC6oz4eU5S7L8sm_u-wnq9YaMzXYrBV2n2NQmEQLB0aHyzQdxglmZVZOPcV9dddSK9epBn7PjPmU_zIm3_TP2dp43HiJUDwnWOr4KV3uM6_BFhHodeo-pGFDMiO3P/s320/alticolor_02.jpg" alt="" id="BLOGGER_PHOTO_ID_5399711951269678194" border="0" /></a>Thanks to a tip from Autochrome collector Mark Jacobs, I have just acquired my first roll of Alticolor film, actually an entire brick. Alticolor was introduced in 1952 by Lumiere, and was discontinued about 1955 (the <a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjowB4dfghQouWPSFlOAXbXlHpdmw8nVEEdw94Hkq14Malw1cvCoG7iluwogISXbfIRrkQ1CuPR-D-p7Fh2kaA3c9d9Nuzt5KXkWNOyGeI-4uM9ubL9nboC5b9ZhPQ9aHeCzu0Gx6poxhj4/s1600-h/alticolor_03.jpg"><img style="margin: 10pt 0pt 10px 10px; float: right; cursor: pointer; width: 125px; height: 112px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjowB4dfghQouWPSFlOAXbXlHpdmw8nVEEdw94Hkq14Malw1cvCoG7iluwogISXbfIRrkQ1CuPR-D-p7Fh2kaA3c9d9Nuzt5KXkWNOyGeI-4uM9ubL9nboC5b9ZhPQ9aHeCzu0Gx6poxhj4/s320/alticolor_03.jpg" alt="" id="BLOGGER_PHOTO_ID_5399737222185255858" border="0" /></a>expiration date on these rolls being July 1956). It was the final roll film version of the additive screen plate process originally introduced as glass plates in 1907 under the Autochrome name. In the early 1930s the first plastic support versions of the Autochrome were introduced under the names Lumicolor (cut sheet film) and Filmcolor (roll film). And finally the new and improved Filmcolor-Ultra-Rapid and Alticolor were introduced in the 1950s.<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNWDg1jc8kYRe4Trsu3Jo8RoW0DeinOvWC0zLuwZ_rCsH9Hsn5A-JmJAMuFeZ5vPQCUNmyjIvRIaJc18e8c-GBG8i1njKvjP0mLgmDHB5pcwz5VqdDelhd-WNjDorhRwxOyuBKTldY4DNE/s1600-h/alticolor_07_1.jpg"><img style="margin: 10pt 10px 10px 0pt; float: left; cursor: pointer; width: 400px; height: 173px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNWDg1jc8kYRe4Trsu3Jo8RoW0DeinOvWC0zLuwZ_rCsH9Hsn5A-JmJAMuFeZ5vPQCUNmyjIvRIaJc18e8c-GBG8i1njKvjP0mLgmDHB5pcwz5VqdDelhd-WNjDorhRwxOyuBKTldY4DNE/s320/alticolor_07_1.jpg" alt="" id="BLOGGER_PHOTO_ID_5399713461263933794" border="0" /></a><br />While all the Autochrome (and Filmcolor, etc...) that I've looked at with a microscope used potato starch grains and carbon black, there is a rumor going around that there was a change to yeast grains at some point, and that carbon black stopped being used to filled the interstices between the grains. So this very late-manufacture Alticolor film is a test of that rumor. I'll report back once I have examined this film with a compound light microscope.<br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3lIStMZooSCVcWf1krEf79ajxmIWn06v5X10mgSDqDRTf9IMakbEdnjwgDEB7qK0HY238IV8m4An98wYnLbaOOD1YXF9yjVhR0oU20fL_FekXtUm9x9wzwH7PUoMrsRDf1wtO4iQ8APGJ/s1600-h/alticolor_06_1.jpg"><img style="margin: 10pt 10px 10px 0pt; float: left; cursor: pointer; width: 396px; height: 278px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3lIStMZooSCVcWf1krEf79ajxmIWn06v5X10mgSDqDRTf9IMakbEdnjwgDEB7qK0HY238IV8m4An98wYnLbaOOD1YXF9yjVhR0oU20fL_FekXtUm9x9wzwH7PUoMrsRDf1wtO4iQ8APGJ/s320/alticolor_06_1.jpg" alt="" id="BLOGGER_PHOTO_ID_5399713455974826146" border="0" /></a>I particularly like the cloth mailing bag that comes with every roll, addressed to the Lumiere processing center in Lyon. And the roll comes in a cute little aluminum capsule. And maybe the film can still be exposed and developed....but that's for another day.Gawainhttp://www.blogger.com/profile/08372910093486243022noreply@blogger.com2