Nucleated high contrast photographic elements containing urea co

Details Nucleated high contrast photographic elements containing urea co Nucleated high contrast photographic elements containing urea co

1991-07-25

1993-05-11

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430604, 430605, 430598, 430603, G03C 106

Patent

active

052100022

ABSTRACT:
Silver halide photographic elements which are capable of high-contrast development and are especially useful in the field of graphic arts comprise surface latent image forming high-chloride silver halide grains and have incorporated therein a hydrazine compound which functions as a nucleator, an amino compound which functions as an incorporated booster, and a combination of a gold compound and a urea compound which functions as a chemical sensitizer. Urea compounds effective for this purpose are 1,1,3,3-tetra-substituted middle chalcogen urea compounds in which at least one substituent comprises a nucleophilic center.

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