Does anyone know what happens if I develop colour photographic paper (c type) in black and white developer? Will I get an image?
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.