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US 6,740,477 B2Granted
Method to reduce corrosivity of photographic processing effluent
AssigneeEastman Kodak Company
InventorsEric R. Schmittou, Cynthia A. Salsedo
Life of this patent
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Abstract
This relates to a method of rendering a used photographic processing solution less corrosive to low carbon steel comprising: taking at least a used photographic processing solution containing a color developing agent and a used photographic processing solution containing a bleaching agent; delivering the used photographic processing solutions to a collection vessel to form a used photographic processing composition; and adjusting the pH of the used photographic processing composition to 6.5 to 11.
Claims8
A method of photographic processing and management of photographic processing solutions comprising:
- A) color developing an imagewise exposed color photographic silver halide material with an aqueous color developing composition comprising a color developing agent,
- B) without removing said color photographic silver halide material from said aqueous color developing composition, contacting said color photographic silver halide material with a photographic fixing composition comprising a photographic fixing agent, thereby forming a combined color development/fixing processing composition,
- C) without removing said color photographic silver halide material form said combined color development/fixing processing composition, contacting said color photographic silver halide material with a photographic bleaching composition, thereby forming a combined color development/fixing/bleaching processing composition, and
- D) delivering the combined color development/fixing/bleaching processing composition to a collection vessel to form a used photographic processing composition.
1 more element
Dependencies are inferred from the claim text.