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

1998-03-23

1999-06-01

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Disparate function simultaneous process step

430418, G03C 538

Patent

active

059087374

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:
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patent: 4954425 (1990-09-01), Iwano
patent: 5178994 (1993-01-01), Yamada

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