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US 4,340,665 AGranted
Silver halide film
AssigneeE. I. Du Pont de Nemours and Company
InventorLloyd G. Sidwell
Life of this patent
Estimating the term…
Abstract
Spots due to iron contamination in developed silver halide films are reduced in number by incorporating therein a phosphate and trisodium hydroxyethylethylenediaminetriacetate.
Claims7
A photographic element comprising a support and at least one silver halide emulsion layer on said support, characterized in that the photographic element contains a combination of a phosphate and trisodium hydroxyethylethylenediamine triacetate;
- said combination being employed in an amount effective to reduce metal particle contamination.
Dependencies are inferred from the claim text.