Proprietary Methods
The K-14 process for Kodachrome films involves adding all the dyes to the emulsion during development.
In colour print development, the Cibachrome process also uses a print material with the dye-stuffs present and which are bleached out in appropriate places during developing. The chemistry involved here is wholly different from C41 chemistry; (it uses azo-dyes which are much more resistant to fading in sunlight).
Read more about this topic: Photographic Developer
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—Virginia Woolf (1882–1941)