Opaque developing composition and its use to process roomlight h

Details Opaque developing composition and its use to process roomlight h Opaque developing composition and its use to process roomlight h

1998-12-04

1999-11-09

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430487, 430489, 430497, G03C 5305

Patent

active

059811536

ABSTRACT:
Black-and-white elements, such as radiographic films, can be processed in roomlight because the developing composition includes a particulate opacifying agent, such as carbon black. Processing is carried out by processing the exposed element using a two-stage process in the same processing container. In the first stage, development is initiated with an opaque developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent in a concentration of from about 0.1 to about 0.5 mol/l, opacifying agent, and a sulfite at from about 0.1 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to begin simultaneous development and fixing. The entire process in quite rapid, that is less than 90 seconds.

REFERENCES:
patent: 3630744 (1971-12-01), Thiers et al.
patent: 4216285 (1980-08-01), Miller
patent: 4471047 (1984-09-01), Mattes et al.
patent: 4803150 (1989-02-01), Dickerson et al.
patent: 4954425 (1990-09-01), Iwano

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