Silver halide developing solutions

Details Silver halide developing solutions Silver halide developing solutions

1992-04-30

1993-05-11

Van Le, Hoa

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430438, 430481, 430482, G03C 530

Patent

active

052100103

ABSTRACT:
There is described a concentrated developer solution which comprises from about 20 to about 60 g/l of dihydroxybenzene developing agent, preferably hydroquinone, from about 0.5 to about 3.0 g/l of an auxiliary developing agent, preferably 1-phenyl-3 pyrazolidinone, from about 300 to about 500 g/l of potassium sulphite and which is buffered to a pH of from about 8 to about 10 with a buffering agent other than an alkanolamine and which comprises sufficient organic solvent other than an alkanolamine to dissolve the hydroquinone.
Such a concentrated developing solution which contains a high concentration of potassium sulphite has when diluted a long useful life and produces images of low graininess.

REFERENCES:
patent: 2753265 (1956-07-01), Kendall et al.
patent: 3178284 (1965-04-01), John et al.
patent: 4987060 (1991-01-01), Mardresano
patent: 5041363 (1991-08-01), Sakuma

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