Gradation-variable black-and-white paper

Details Gradation-variable black-and-white paper Gradation-variable black-and-white paper

1988-11-10

1991-04-09

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430611, 430613, G03C 1035, G03C 134

Patent

active

050064550

ABSTRACT:
A gradation-variable BW paper comprising only one silver halide emulsion layer, in which re-sensitization is avoided, is obtained with a mixture of at least two photosensitive silver halide emulsions, of which one has its absorption maximum in the range from 480 to 580 while the other has its absorption maximum below 480 nm, providing the emulsion which has its absorption maximum below 480 nm contains a compound corresponding to the following formula ##STR1## in which X represents the remaining members of an optionally benzo- or naphtho-condensed heterocycle optionally containing further substituents.

REFERENCES:
patent: 2403927 (1946-07-01), Kendall et al.
patent: 3628960 (1971-12-01), Philippaerts et al.
R D 24236, Jun. 1984.

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