Yellow dye-containing developing/fixing monobath and method for processing roomlight handleable black-and-white photographic elements
AssigneeEastman Kodak Company
InventorsAlan S. Fitterman, Robert E. Dickerson, Franklin C. Brayer
Life of this patent
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Abstract
Black-and-white elements, such as radiographic films, can be processed in roomlight using a developing/fixing monobath composition that also includes a water-soluble colorant, such as a water-soluble "yellow" dye, that provides safelight conditions in the processing composition. The processing method is carried out quickly, that is within 120 seconds. The colorant has a maximum absorption wavelength of from about 350 to about 500 nm, and is transparent in solution.
Claims8
A black-and-white developing/fixing composition having a pH of from about 10 to about 12.5, and comprising:
- at least 0.05 mol/l of a black-and-white developing agent,
- up to 0.5 mol/l of a sulfite,
- at least 0.5 mol/l of a fixing agent other than a sulfite, and
- at least 1 weight % of a water-soluble colorant that has a maximum absorption wavelength of from about 350 to about 500 nm.
A photographic processing kit comprising:
- a) a black-and-white developing/fixing composition having a pH of from about 10 to about 12.5, and comprising:
- at least 0.05 mol/l of a black-and-white developing agent,
- up to 0.5 mol/l of a sulfite,
- at least 0.5 mol/l of a fixing agent other than a sulfite, and
- at least 1 weight % of a water-soluble colorant that has a maximum absorption wavelength of from about 350 to about 500 nm, and
- b) one or more of the following components:
- i) a processing container, and
- ii) a photographic silver halide element comprising at least one silver halide emulsion layer.
Dependencies are inferred from the claim text.