Photographic processing solution containing ternary ferric-complex salts
AssigneeEastman Kodak Company
InventorsStuart Terrance Gordon, Keith Henry Stephen, Eric Richard Brown, Celia Ann DeAndrea, Mary Morris Podhorecki, William George Henry
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Abstract
A composition for bleach-fixing a silver halide photographic element comprising a fixing agent and a ternary ferric-complex salt formed by a tetradentate ligand and a tridentate ligand and a method of bleach-fixing using said composition.
Claims21
A composition for bleach-fixing an imagewise exposed and developed silver halide photographic element comprising a fixing agent present in an amount of from 0.1 to 3 mol/l, and a ternary ferric-complex salt formed by a tetradentate ligand and a tridentate ligand, wherein the ratio of tetradentate ligand to ferric ion is in the range of from 0.9 to 1.5 and the ratio of tridentate ligand to ferric ion is in the range of from 0.5 to 10, and the amount of ferric ion is from 0.01 to 1 mol/l, wherein said tridentate ligand is represented by Formula I and said tetradentate ligand is represented by Formula II ##STR6## wherein R is H or an alkyl group, X is a linking group, m and n are 1, 2 or 3, and p and q are 1.
A method of desilvering an imagewise exposed and developed silver halide photographic element comprising processing the silver halide element in a bleach-fix composition comprising a fixing agent present in an amount of from 0.1 to 3 mol/l, and a ternary ferric-complex salt formed by a tetradentate ligand and a tridentate ligand, wherein the ratio of tetradentate ligand to ferric ion is in the range of from 0.9 to 1.5 and the ratio of tridentate ligand to ferric ion is in the range of from 0.5 to 10, and the amount of ferric ion is from 0.01 to 1 mol/l,
- wherein said tridentate ligand is represented by Formula I and said tetradentate ligand is represented by Formula II ##STR7## wherein R is H or an alkyl group, X is a linking group, m and n are 1, 2 or 3, and p and q are 1.
Dependencies are inferred from the claim text.