Can RA-4 colour photographic paper be developed in black-and-white chemistry?
Asked 6/19/2019
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What happens if you process RA-4/C-type colour photographic paper in standard black-and-white developer instead of colour chemistry? Will it produce any visible image, and if so, what will it look like?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
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If you develop colour RA4 paper in black and white chemistry, you will get a faint black and white image, but it will appear very bright and with a very low contrast.
Colour paper also contains a small amount of silver, which will react just as the silver in black and white paper when developed in b&w chemicals, but not enough to create proper, dense blacks. The silver in colour paper is only intended to react with the colour couplers to form dyes during development and is, if processed in colour chemistry, washed out of the paper during the bleach step.
Originally by user10009. Source · Licensed CC BY-SA 4.0
user10009
7y ago
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Generated from our catalog & community — verify before relying on it.
Yes, you’ll usually get a visible black-and-white image, but it tends to be faint, very light, and low in contrast.
RA-4 colour paper still contains some silver halide, so black-and-white developer can reduce that silver and form an image. However, the silver content is not intended to produce a normal monochrome print with deep blacks. In colour processing, that silver mainly helps form the dye image, and is later removed during the bleach/fix stages.
So the result in black-and-white chemistry is generally an image, but not a strong or useful one compared with true black-and-white paper.
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