Dye-diffusion transfer process

A process for the production of (a) dye image(s) by dye diffusion transfer comprising the steps of:

• (1) image-wise photo-exposing a photographic colour material, which contains at least one alkali-permeable silver halide hydrophilic colloid layer which contains in operative contact therewith or therein a non-diffusing dye or dye precursor compound that when contacted with an aqueous alkaline liquid remains immobile in an alkali-permeable colloid layer of said material and is capable of being reduced by a silver halide developing agent at a rate slower than the reduction of image-wise developable silver halide of said silver halide hydrophilic colloid layer and in reduced state under alkaline conditions is capable of releasing a diffusible dye or dye precursor moiety, and
• (2) applying an aqueous alkaline liquid to said photoexposed material effecting development in the presence of a developing agent and effecting with said liquid diffusion-transfer of said diffusible dye or dye precursor moiety to a receiving layer,
• characterized in that said liquid contains triisopropanolamine.