Reducer and reduction method for silver images

Details Reducer and reduction method for silver images Reducer and reduction method for silver images

1995-01-04

1995-09-05

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

Process using lithographic infectious developer

430331, 430430, 430461, G03C 542

Patent

active

054478219

ABSTRACT:
A reducer containing a ferric chelate compound of an amino compound and further containing an reduction accelerator and/or a complex-forming agent and a dye. ##STR1## wherein A.sub.41, A.sub.42 and A.sub.43 each individually represents a carboxyl group, a phosphono group, a sulfo group or a hydroxyl group; L.sub.41 and L.sub.42 each individually represents a divalent coupling group containing an aliphatic group, an aromatic group, a heterocyclic group or combinations thereof; R.sub.41 represents a substituent; and a represents 0, 1, 2, 3 or 4. The reducer is superior in the rate of reduction, reducibility and reduction working properties and so stable that no precipitate will separate out with time. Also disclosed is a silver image reducing method wherein a silver image formed by exposing and developing a silver halide photosensitive material is reduced in the presence of the above-described reducer. The reducer and the reducing method are suitable for application to high-contrast photosensitive materials.

REFERENCES:
patent: 4837122 (1989-06-01), Kondo et al.
patent: 5009985 (1991-04-01), Kunitz et al.
patent: 5139920 (1992-08-01), Hayashi et al.
patent: 5188927 (1993-02-01), Okada et al.
patent: 5250402 (1993-10-01), Okada et al.
patent: 5256531 (1993-10-01), Okada et al.

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