Ascorbic acid developing compositions containing sugar and methods of use
AssigneeEastman Kodak Company
InventorsShirleyanne E. Haye, Janet M. Huston, Jacques Roussilhe
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Abstract
A black-and-white photographic developing composition has improved stability and is more compatible with the environment when discarded. The composition includes one or more ascorbic acid developing agents and is essentially free of hydroquinone and similar developing agents. It comprises a mono- or disaccharide such as ribose, fructose, lactose, glucose or galactose as a stabilizing agent for the developing agent.
Claims18
A black-and-white photographic developing composition that is essentially free of dihydroxybenzene compounds and comprises:
- a) an ascorbic acid developing agent, and
- b) a stabilizing amount of a mono- or disaccharide.
An aqueous black-and-white photographic developing composition having a pH of from about 8 to about 11 and that is essentially free of dihydroxybenzene compounds and comprises:
- a) from about 0.05 to about 0.3 mol/l of an ascorbic acid developing agent,
- b) from about 0.05 to about 0.25 mol/l of ribose, fructose, lactose, glucose or galactose as a stabilizing agent,
- c) from 0 to about 0.5 mol/l of a sulfite preservative,
- d) from about 0.005 to about 0.04 mol/l of a 3-pyrazolidone co-developing agent, and
- e) an organic antifoggant.
A photographic processing kit comprising:
- a black-and-white photographic developing composition that is essentially free of dihydroxybenzene compounds and comprises:
- a) an ascorbic acid developing agent,
- b) a stabilizing amount of a mono- or disaccharide, and
- c) optionally a sulfite preservative, and
- one or more additional photographic processing compositions.
Dependencies are inferred from the claim text.