Photography – Fluid-treating apparatus – Photographic medium processing vessel
Patent
1998-06-05
1999-09-21
Rutledge, D.
Photography
Fluid-treating apparatus
Photographic medium processing vessel
430497, G03D 1304
Patent
active
059565390
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 first vessel containing a developing composition, a second vessel containing fixing composition, and a hand-held container for holding one or more exposed photographic elements. The container has a manually actuated assembly for creating a vacuum within said container in order to draw developing and fixing compositions into said container to contact and develop the exposed photographic element.
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Dickerson Robert E.
Fitterman Alan S.
Kelch Peter J.
Perry Ronald J.
Romano Nathan J.
Eastman Kodak Company
Noval William F.
Rutledge D.
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