First color example.

[Ray Rogers]

Strange you should mention that! I think you are a bit late for that footnote!

 

[Photo Engineer]

Cuprous oxide is light sensitive and can be made into a B&W paper that is about the same speed as Kodabromide. I have several publications on that but no patent. They are in Kodak Research Disclosures. Copper salts at this level adversely affect AgX emulsions and probably cannot be used. I may have to use Calcium, Magnesium, or something stronger like Barium! The last one is probably not a good idea.

PE

 

[wildbillbugman]

PE,
Thank you ! This is great ! Although I personally have gone a in a different direction, your work will help many, I am sure. I have too much fascination with the gray scale color separation process to get into color emulsions myself. I have not even purchased any color film in about 5 years . But knowledge for the sake of knowledge is wonderful.
Bill

 

[Photo Engineer]

Well, you can get a full color image from my method this way....

Make 3 color separation negatives by exposing in-camera and developing normally.

Then, take each separation and soak it in a dye solution so that the blue separation gets yellow dye and etc.... You may need to use a mordant or metal salt to anchor the dye in place such that you get a density of about 3.0.

Then run the dye bleach process that I gave above for each of the 3 negatives and it will give you 3 positives.

These, mounted in register, will give you a rather nice color transparency just as a similar method using three color developers and an appropriate set of couplers will give you Kodachrome like slides.

PE

 

[holmburgers]

A 2-Color Monopack by the Dye-Bleach Method

From Friedman's chapter on 'Gasparcolor and Silver-Dye Bleach':

The preparation of a monopack suitable for two-color work, has also not been overlooked (USP 2028279). But instead of coloring each layer with a single dye, two are used. Thus the orange-red layer will contain pyramine orange and azo fuchsin, or azo fuchsin and mordant yellow, while the green layer will contain benzo pure blue and pyramine orange or benzo pure blue and metanil yellow. The rate at which the two dye components are acted on by the bleach solutions varies with the dyes. Thus it becomes possible to obtain dichroic effects in each layer, orangy highlights with deep red shadows in the orange-red layer, and sky-blue highlights with deep green shadows in the other. It becomes possible in this manner to obtain pleasant flesh and sky renditions, and at the same time, maintain true blacks in the middle tones & shadows. Such a process could be termed "two and one-half color."