Silver halide photographic material and method for forming an ul

Details Silver halide photographic material and method for forming an ul Silver halide photographic material and method for forming an ul

1987-09-14

1989-04-25

Shah, Mukund J.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430264, 430486, 430494, 430640, 430949, G03C 504, G03C 524, G03C 102

Patent

active

048247740

ABSTRACT:
A silver halide negative photographic material is described, comprising a support, at least one silver halide emulsion layer, and one or more light-insensitive hydrophilic colloid layers, wherein said silver halide emulsion layer or said light-insensitive hydrophilic colloid layer contains a hydrazine derivative, and the photographic material has a film surface pH not higher than 5.8 on the side of said emulsion layer inclusive of said light-insensitive hydrophilic colloid layer; in another aspect, this invention is directed to a method for forming an ultrahigh contrast negative image, comprising exposing said photographic material imagewise, followed by development processing of the same with a developer containing at least 0.15 mol/liter of sulfite ion and having a pH of from 10.5 to 12.3.

REFERENCES:
patent: 4168977 (1979-09-01), Takada et al.
patent: 4224401 (1980-09-01), Takada et al.
patent: 4243739 (1981-01-01), Mifune et al.
patent: 4269929 (1981-05-01), Nothangle
patent: 4272606 (1981-06-01), Mifune et al.
patent: 4311781 (1982-01-01), Mifune et al.
patent: 4510228 (1985-04-01), Tsubai et al.
patent: 4560638 (1985-12-01), Loblaw et al.
T. H. James, "Coating Effects and Halogen Acceptance", Theory of the Photographic Process, (1977).
Research Disclosure No. 235 "Development Nucleation by Hydrazine and Hydrazine Derivatives", pp. 346-352, (1983).

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