Stabilized bleach-fixing baths
AssigneeEastman Kodak Company
InventorsGary L. Borton, Cobb S. Goff, Richard J. Malloy
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Abstract
A bleach-fix composition for use in photographic processing comprising a polycarboxylic acid bleaching agent, a thiosulfate fixing agent, and a carbonyl bisulfite adduct. The carbonyl bisulfite adduct functions as a stabilizing agent which retards sulfurization of the bleach-fix composition and thereby prolongs its useful life.
Claims27
A bleach-fix composition for use in photographic 1 comprising
- (10 a bleaching agent which is an iron or cobalt complex of a polycarboxylic acid,
- (2) a thiosulfate fixing agent, and
- (3) an amount sufficient to retard sulfurization of said bleach-fix composition of a carbonyl bisulfite adduct comprising at least two carbon atoms.
A bleach-fix composition for use in photographic processing comprising ammonium thiosulfate, the ammonium salt of ferric ethylenediaminetetraacetic acid, and sodium acetaldehyde bisulfite in an amount sufficient to retard sulfurization of said composition.
A bleach-fix composition for use in photographic processing comprising ammonium thiosulfate, the ammonium salt of ferric ethylenediaminetetraacetic acid, and glutaraldehyde bis-sodium bisulfite in an amount sufficient to retard sulfurization of said composition.
A method of increasing the resistance to sulfurization of a photographic bleach-fix composition containing a bleaching agent which is an iron or cobalt complex of a polycarboxylic acid and a thiosulfate fixing agent, which method comprises incorporating therein an effective amount of a carbonyl bisulfite adduct comprising at least two carbon atoms.
Dependencies are inferred from the claim text.