Diffusion transfer material and process

A photographic silver halide material comprising a support carrying at least one alkali-permeable silver halide hydrophilic colloid emulsion layer which contains therein a quinonoid compound which is immobile in an alkali-permeable colloid medium when permeating said medium with an alkaline aqueous liquid and which contains a dye moiety and a ballasting group, wherein said compound is capable of being reduced by a silver halide developing agent at a rate slower than that of image-wise developable silver halide in the photographic material and in reduced state is capable of releasing said dye moiety under alkaline conditions, characterized in that said quinonoid compound corresponds to the following general formula:

• ##STR31## wherein:
• R.sup.8 is hydrogen or methyl in the 6- or 7-position (indicated by an asterisk) on the saturated adjacent ring part of the quinonoid nucleus,
• R.sup.9 is an alkyl group or an aromatic group,
• R.sup.10 is hydrogen, an alkyl group or an aryl group, and at least one of the substituents R.sup.9 and R.sup.10 represents or includes a ballasting group of sufficient size to render said compound immobile in an alkali-permeable hydrophilic colloid layer when such layer is permeated with an aqueous alkaline liquid.