Photography – Fluid-treating apparatus – Dark cabinet
Patent
1998-06-05
1999-11-16
Mathews, Alan A.
Photography
Fluid-treating apparatus
Dark cabinet
396602, 396603, 396644, G03B 300
Patent
active
059845384
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, a vessel containing a developing composition, a vessel containing fixing composition, and a light-tight, hand-held container for holding an exposed element as it is inserted into the first and second vessels to carry out processing.
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Bergstresser William
Perry Ronald J.
Robertson Jeffrey C.
Sherburne David G.
Eastman Kodak Company
Mathews Alan A.
Noval William F.
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