Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product – Process using lithographic infectious developer
Patent
1986-12-29
1988-08-02
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
Process using lithographic infectious developer
430264, 430265, 430266, 430446, 430448, 430444, 430434, 430502, 430509, 430949, G03C 106
Patent
active
047613629
ABSTRACT:
An image forming process capable of providing photographic images having extremely high contrast and high resolution for use in photoengraving is disclosed, which comprises processing an image-wise exposed silver halide light-sensitive material having at least two silver halide emulsion layers on a support, one of said emulsion layers providing a contrasty gradation and the other of said emulsion layers providing a soft tone gradation, with a hydrazine contrast development system, a tetrazolium contrast development system or a lith development system, wherein the gamma (.gamma.) value of the portion having a density (D) from 0.3 to 1.5 on the characteristic curve obtained is less than 10 and the gamma (.gamma.) value of the portion having a density (D) from 1.5 to 3.0 is at least 10.
REFERENCES:
patent: 4035185 (1977-07-01), Evans et al.
patent: 4332885 (1982-06-01), Ohmatsu
patent: 4681836 (1987-07-01), Inoue et al.
Inagaki Yoshio
Kameoka Kimitaka
Katoh Kazunobu
Moriuchi Shigenori
Sasaoka Senzo
Doody Patrick A.
Fuji Photo Film Co. , Ltd.
Michl Paul R.
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