Method for processing roomlight handleable radiographic films us

Details Method for processing roomlight handleable radiographic films us Method for processing roomlight handleable radiographic films us

1997-11-14

1999-02-16

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Disparate function simultaneous process step

430434, 430438, G03C 538

Patent

active

058718907

ABSTRACT:
Black-and-white elements, such as radiographic films, can be processed in roomlight because they include certain light absorbing dyes and desensitizers. Processing is carried out by processing the exposed element using a two-stage process in the same light-tight processing container. In the first stage, development is initiated with a 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, and a sulfite at from about 0.25 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to provide a combined developing/fixing compositions, and development and fixing are carried out simultaneously. The processing method is carried out quickly, usually within about 90 seconds, including a washing step at the end. The presence of sulfite and high pH in both stages decolorize or deactivate the particulate dyes.

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