Colour photographic process and material using masked developer - combining high colour densities with decreased fogging and sensitivity to process variations, also allowing use of developer free baths

摘要

In a new process for generating a coloured picture from a dye coupler contg. silver halogenide material the development takes place in presence of a cpd. of formula (I), where R1, R2 and C form a system able to couple at the C-atom; NLG = 'non-leaving group' which cannot be hydrolytically cleaved; and DEV = developer rest. Also claimed is a silver halogenide colour photographic material contg. (I). Pref. cpd. (I) can either be present in the developer bath or in the silver halogenide material. The concn. of (I) in the silver halogenide emulsion layer is pref. 5-100 mmole/m2, esp. 10-50 mmole/m2. The colour photographic silver halogenide material comprises: (a) = 1 dye coupler; (b) = 1 silver halogenide emulsion layer, = 1 of which contains a cpd. (I).