Composition for developing an exposed photographic product having improved stability in air
AssigneeEastman Kodak Company
InventorsJacques Roussilhe, Claude Germain Goumont
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Abstract
A novel inorganic composition for developing silver halide photographic products has improved stability in air. The composition comprises at least one oxidizable metallic ion, ethylenediamine tetraacetic acid and at least one additional complexing agent of formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are each independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a hydroxyl group, or a hydroxyalkyl group, R.sup.3 is --COOM wherein M is hydrogen or a counter-ion such as lithium, sodium or potassium, or --CONR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are each independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, and n, p and q are independently 1, 2 or 3.
Claims16
A method for processing an imagewise exposed silver halide photographic product comprising black-and-white developing said photographic product with an inorganic photographic developing composition consisting essentially of at least 0.05M of at least one inorganic black-and-white developing agent that is an oxidizable metallic ion capable of reducing silver ions to silver metal, ethylenediamine tetraacetic acid, and at least one additional complexing agent of formula (I):
- ##STR9## wherein R.sup.1 and R.sup.2 are each independently hydrogen, an alkyl group of 1 to 10 carbon atoms, hydroxyl, or hydroxyalkyl group,
- R.sup.3 is --COOM wherein M is hydrogen or a counter-ion, or --CONR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are each independently a hydrogen atom, or an alkyl group of 1 to 10 carbon atoms, and n, p and q are independently 1, 2 or 3,
- wherein the metallic ion/complexing agent molar ratio is between 1/1 and 1/10, and the molar concentration of said additional complexing agent (I) is equal to at least 10% of the total concentration of complexing agents.
Dependencies are inferred from the claim text.