Black and white paper with variable gradation

Details Black and white paper with variable gradation Black and white paper with variable gradation

1996-07-22

1997-09-09

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430572, 430576, 430588, 430595, G03C 116, G03C 118, G03C 129

Patent

active

056655320

ABSTRACT:
A black & white paper with variable gradation containing a silver chloride-bromide emulsion, which is divided into at least three portions, one of which is sensitised with a blue sensitiser and two further portions are sensitised both with differing quantities of blue sensitiser and with differing quantities of a green sensitiser, wherein the blue sensitiser is of the formula (I) and the green sensitiser is of the formula (II) ##STR1## in which R.sub.1 to R.sub.8, X.sup.(-) and m have the meaning stated in the specification, is distinguished by an extended gradation range.

REFERENCES:
patent: 3933507 (1976-01-01), Von Konig et al.
patent: 4724200 (1988-02-01), Maskasky
patent: 4987063 (1991-09-01), Kampfer et al.
patent: 5091298 (1992-02-01), Parton et al.

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