I found 3 photolithographs (also called Photochroms) made by the Detroit Publishing Co. of Detroit's Belle Isle park. The Library of Congress has some info on them, and the Wikipedia entry on Photochrom 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:
And here's what they look like under magnification!
I also found a nice overpainted salt print
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!):
