Abstract: A photographic element having at least two silver halide emulsion layers, one layer containing a colorless cyan-forming coupler which produces a negative image and the other layer containing a colored coupler which upon color development with a p-phenylene diamine developer produces a positive dye image of contrasting color to cyan, will produce a color contrast radiographic picture after exposure and development.
Type:
Grant
Filed:
November 25, 1977
Date of Patent:
July 15, 1980
Assignee:
Minnesota Mining and Manufacturing Company
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