176534 ⎘
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; Materials characterised by the use of combinations of photographic compounds known as such, or by a particular location in the photographic element Combinations of couplers and photographic additives
Sub-classes: