Ascorbic acid developing compositions stabilized with sulfo compound and methods of use

Year	Description
2000	Invention patented by Shirleyanne E. Haye, Janet M. Huston, John S. Badger, and Jacques Roussilhe on October 19th, 2000. 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 a preservative (such as a sulfite) and is essentially free of hydroquinone and similar developing agents. Improved stability is provided using a sulfo-substituted organic compound as a stabilizing agent. Such compounds are either aliphatic sulfo compounds or hydroxy-free aromatic sulfo compounds.
Source: selected by the editor from original sources.

Invention: Ascorbic acid developing compositions stabilized with sulfo compound and methods of use