176579 ⎘
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; Colour coupling substances Couplers characterised by a group not in coupling site, e.g. ballast group, as far as the coupling rest is not specific
Sub-classes: