Radiation imagery chemistry: process – composition – or product th – Post imaging processing – With structural limitation
Patent
1998-06-05
1999-08-03
Le, Hoa Van
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
With structural limitation
430496, G03C 136
Patent
active
059323981
ABSTRACT:
Black-and-white elements, such as radiographic films, can be processed in roomlight because they include certain light absorbing dyes and desensitizers. Processing of such elements can be achieved using a processing kit and a two-stage process carried out in the same light- and fluid-tight processing apparatus. 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 and a sulfite. After an appropriate time, a non-sulfite fixing agent is introduced into the processing apparatus or container to provide a combined developing/fixing composition, and development and fixing are carried out simultaneously. The processing method is carried out quickly, usually within about 90 seconds. The presence of sulfite and high pH in both stages decolorizes or deactivates the particulate dyes. The processing kit includes the photographic element, and two or more of a developing composition, a fixing composition, and a suitable light- and fluid-tight processing apparatus.
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Dickerson Robert E.
Fitterman Alan S.
Kelch Peter J.
Perry Ronald J.
Eastman Kodak Company
Le Hoa Van
Tucker J. Lanny
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