Image forming method

Details Image forming method Image forming method

1991-02-25

1992-10-06

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430265, 430567, 430598, G03C 106

Patent

active

051530988

ABSTRACT:
An image forming method for forming a black-and-white image with a gamma value of at least 8 is disclosed, which comprises processing an imagewise expsed negative type photographic material having at least one silver halide emulsion layer on a support, and containing a hydrazine derivative represented by formula (I) in the emulsion layer or in another hydrophilic colloid layer on the support, with a developer having a pH of 11.2 or less, wherein the silver halide grains are octahedral or tetradecahedral grains: ##STR1## wherein R.sub.1 represents an aliphatic or aromatic group, R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a carbamoyl group or an oxycarbonyl group, G.sub.1 represents a carbonyl group, a sulfonyl group, a sulfoxy group ##STR2## group, or an iminomethylene group, and A.sub.1 and A.sub.2 each represents a hydrogen atom, or one is a hydrogen atom and the other is a substituted or unsubstituted alkylsulfonyl group, a substituted or unsubstituted arylsulfonyl group, or a substituted or unsubstituted acyl group.

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patent: 5030547 (1991-07-01), Katoh et al.
patent: 5075198 (1991-12-01), Katoh

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