Photographic peracid bleaches with ferric 2-pyridinecarboxylate and 2,6-pyridinecarboxylate catalysts
AssigneeEastman Kodak Company
InventorsJohn M. Buchanan, Stuart T. Gordon, Keith H. Stephen, Richard P. Szajewski, Sidney J. Bertucci
Life of this patent
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Abstract
This invention provides an accelerator for peracid bleaches used for bleaching silver halide photographic elements. The accelerator is a complex of ferric (Fe III) ion and a 2-pyridinecarboxylic acid or a 2,6-pyridinecarboxylic acid. The accelerator may be contained in the bleaching solution, a solution preceding the bleaching solution or in the photographic elements themselves.
Claims27
A bleaching composition for color silver halide photographic elements, said bleaching composition comprising a peracid or peracid bleaching agent salt and an accelerating amount of a complex of ferric ion and a 2-pyridinecarboxylic acid or a 2,6-pyridinedicarboxylic acid.
A method of processing an imagewise exposed and developed color photographic element comprising contacting the photographic element with a bleach prebath solution comprising a complex of ferric ion and a 2-pyridinecarboxylic acid or a 2,6-pyridinedicarboxylic acid, and subsequently contacting the photographic element with a peracid bleaching solution.
Dependencies are inferred from the claim text.