Method for developing silver halide emulsions

Abstract

Abstract A photographic developing method is described which comprises developing an exposed silver halide emulsion layer of a photographic material with an aqueous alkaline composition in the presence of a hydroxylamine developing agent and a p-phenylene diamine or p-aminophenol derivative corresponding to one of the formulas WHEREIN: WHEREIN: R1 stands for an alkyl group, R2 stands for alkyl or for ethylene, substituted ethylene, propylene or substituted propylene attached to the adjacent ortho-carbon atom of the benzene ring, R3 stands for alkyl, and R4 stands for an alkyl group, AT MOST ONE OF R1 and R4 being substituted alkyl; WHEREIN: WHEREIN: EACH OF R5 and R6 stands for an alkyl group, and X1 stands for an electron-donating group; and WHEREIN: EACH OF X2 and X3 stands for hydrogen, halogen or an electrondonating group, Y stands for OH or NH2, and R7 stands for ethylene, substituted ethylene, propylene or substituted propylene attached to the adjacent ortho-carbon atom of the benzene ring, and R8 stands for hydrogen, an alkyl group or has the same significance as R7, or R7 together with R8 and the N-atom to which they are attached from a pyrrolidine ring. The p-phenylene diamine or p-aminophenol derivative has a superadditive developing affect with the hydroxyl amine developing agent.

Inventors

• 👤 J Willems

Bibliographic Details