Bis-azo pyrazolone type dye developer and light-sensitive material

In a photographic unit for the diffusion transfer process comprising

• a. a light-sensitive element comprising a support having thereon at least one silver halide emulsion layer and a cyan dye developer associated therewith,
• b. an image-receiving element comprising (1) a support, (2) an image-receiving layer for receiving dyes transferred on development of the light-sensitive element, and (3) a layer containing an alkali-neutralizing agent positioned between said support for said image-receiving element and said image-receiving layer;
• and
• c. an alkaline liquid processing composition for spreading between said light-sensitive element and said image-receiving element for development of said silver halide in said light-sensitive element and transfer of dye images from said light-sensitive element to said image-receiving element;
• the improvement wherein the cyan dye developer comprises a compound represented by the following general formula (I);
• ##EQU14## wherein X represents the atoms necessary for completing a monocyclic or polycyclic aromatic group;
• Y represents an acyl group having 1 to 4 carbon atoms;
• Ar and Z each represents a phenyl nucleus or a naphthalene nucleus, with Ar being connected either directly or through a divalent atom or group to a polyhydric phenol moiety having a silver halide developing action;
• R represents an alkyl group or an alkoxy group;
• n represents an integer of 0 to 4;
• and Q represents ##EQU15## wherein Z' represents a hydrogen atom or an alkyl group, R.sub.2 and R.sub.3 each represents a hydrogen atom or an aliphatic group, or R.sub.2 and R.sub.3 can combine to form a divalent aliphatic group.