High-speed direct-positive photographic elements utilizing core-

Details High-speed direct-positive photographic elements utilizing core- High-speed direct-positive photographic elements utilizing core-

1993-03-25

1996-07-02

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430598, 430603, 430604, 430605, G03C 1035

Patent

active

055321194

ABSTRACT:
Direct-positive photographic elements are comprised of a support and a silver halide emulsion layer containing core-shell silver halide grains comprising a chemically sensitized core and a chemically sensitized shell, wherein at least one of the core and the shell comprises a band of dopant and wherein the dopant is hexacyano ruthenium (II). Preferably, the shell of the core-shell grains is chemically sensitized with both a gold-containing chemical sensitizing agent and a sulfur-containing chemical sensitizing agent and the weight ratio of the gold-containing chemical sensitizing agent to the sulfur-containing chemical sensitizing agent is at least about two to one.

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United States Statutory Invention Registration H1294 to Tamada et al., Mar. 1, 1994.

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