Methods of providing color photographic image using acidic stop and rinse solutions
AssigneeEastman Kodak Company
InventorsShirleyanne E. Haye, Janet M. Huston
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Abstract
Photographic processing of color photographic materials can be carried out using polyphosphonic acids or salts thereof in acidic “stop” solutions or wash solutions after color development. When used in acidic stop solutions, the polyphosphonic acid is preferably carried over into the bleaching solution to provide added stability of the bleaching agent. The acidic stop solutions can also include organic thiols that are used as bleaching accelerators when carried over into the bleaching solutions.
Claims16
A method for providing a color photographic image comprising:
- A) color developing an imagewise exposed color photographic material using a color developing composition comprising at least 0.0005 mol/l of a color developing agent,
- B) stopping color development by contacting said color photographic material with an acidic stop solution having a pH less than or equal to 5, and
- C) desilvering said color photographic material with a composition having photographic bleaching capability,
- provided that said acidic stop solution comprises at least 0.001 mol/l of a polyphosphonic acid or a salt thereof, and a portion of said stop solution is carried over into said bleaching composition at a rate so that the amount of said polyphosphonic acid (or salt thereof) carried over into said bleaching composition is from about 0.000005 to about 0.001 mol per m2 of processed color photographic material.
A method for providing a color photographic image comprising:
- A) color developing an imagewise exposed color negative photographic film or color photographic paper using a color developing composition comprising at least 0.0005 mol/l of a color developing agent and at least 0.0005 mol/l of an organic antioxidant,
- B) stopping color development by contacting said color photographic material with an acidic stop solution having a pH of from about 1 to about 5, and comprising from about 0.001 to about 1 mol/l of morpholinomethanediphosphonic acid (or a salt thereof) and from about 0.0005 to about 0.5 mol/l of L-cysteine or 2-dimethylaminoethanethiol-HCl,
- C) bleaching said color negative photographic film or color photographic paper with a peroxide or persulfate photographic bleaching composition, and
- D) subsequently or simultaneously, fixing said bleached color negative photographic film or color photographic paper,
- wherein said acidic stop solution is carried over into said bleaching composition at a rate such that said morpholinomethanediphosphonic acid (or a salt thereof) is carried over to said bleaching composition in an amount of from about 0.000005 to about 0.001 mol per m2 of processed color negative photographic film or color photographic paper.
Dependencies are inferred from the claim text.