Patent ID: 6489090
Filing Date: 2002-12-03
Classification: G03C

Abstract:
A black-and-white photographic developing composition that comprises:a) from about 0.01 to about 0.6 mol/l of an ascorbic acid developing agent, b) from about 0.01 to about 0.5 mol/l of a &agr;-ketocarboxylic acid, and c) from about 0.01 to about 1 mol/l of a sulfite preservative, wherein the molar ratio of said &agr;-ketocarboxylic acid to said ascorbic acid developing agent is from about 0.125:1 to about 1:1, the molar ratio of said &agr;-ketocarboxylic acid to said preservative is from about 0.08:1 to about 4:1, and said composition is essentially free of dihydroxybenzene compounds.