176563 ⎘
Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes; Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials; Substances liberating photographically active agents, e.g. development-inhibiting releasing couplers characterised by the releasing group 2-equivalent couplers, i.e. with a substitution on the coupling site being compulsory with the exception of halogen-substitution
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