Stabilized ascorbic acid developing compositions and methods of use

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 dev...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	MCGUCKIN, HUGH GERALD, HAYE, SHIRLEYANNE ELIZABETH, HUSTON, JANET MARIE, ROUSSILHE, JACQUES
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AUXILIARY PROCESSES IN PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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. It comprises an alpha -ketocarboxylic acid stabilizing agent at a molar ratio to the ascorbic acid developing agent of from 0.05:1 to 2.5:1, and at a molar ratio to the preservative of from 0.05:1 to 6.25:1.