Monday, October 31, 2011

The ghostly effects of platinum images

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).

Wednesday, August 3, 2011

Kodak Notch Codes in the 1970s

Although 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:

Kodak Color Dataguide
Kodak Color Dataguide 1966
Kodak Color Dataguide 1971
Kodak Color Dataguide 1974
Kodak Color Dataguide 1975
Kodak Color Dataguide 1976
Kodak Color Dataguide 1977 supplement
Kodak Color Dataguide 1978