Black-and-white development processing method with replenishment

Details Black-and-white development processing method with replenishment Black-and-white development processing method with replenishment

1997-01-06

1998-04-14

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Regenerating image processing composition

Developer

430435, 430436, 430440, 430446, 430480, 430483, 430492, G03C 531

Patent

active

057389799

ABSTRACT:
A photographic silver halide element, such as a radiographic film, can be developed using a black-and-white developing solution containing an ascorbic acid developing agent. This solution is replenished with a replenisher solution of basically the same components but the amounts may be greater. Moreover, the replenisher solution pH is from 0.1 and up to 0.3 pH units higher than that of the developing solution. Both developing and replenisher solutions are free of hydroquinone. Replenishment can be carried out at relatively low rates with less impact on the environment without sacrificing sensitometric performance.

REFERENCES:
patent: 5210010 (1993-05-01), Fielding
patent: 5236816 (1993-08-01), Purol et al.
patent: 5376510 (1994-12-01), Parker et al.
patent: 5389502 (1995-02-01), Fitterman et al.
patent: 5503965 (1996-04-01), Okutsu
patent: 5552265 (1996-09-01), Bredoux et al.

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