Subtractive colour processes using differently sensitised films, each coated on its own base, e.g. bipacks, tripacks

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Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes (diffusion transfer processes G03C8/00) > Subtractive colour processes using differently sensitised films, each coated on its own base, e.g. bipacks, tripacks