Direktpositivemulsionen mit verbesserter Strahlungsempfindlichkeit
Direct-positive photographic elements are described which comprise uniformly fogged radiation-sensitive silver halide and a selenium compound of the formula : R - Se - Q wherein R is alkyl, aralkyl, alkaryl, aryl or a heterocyclic ring system and Q represents -Se-R' or -S-R' wherein R'...
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Main Authors | , |
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Format | Patent |
Language | German |
Published |
21.10.1971
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Subjects | |
Online Access | Get full text |
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Summary: | Direct-positive photographic elements are described which comprise uniformly fogged radiation-sensitive silver halide and a selenium compound of the formula : R - Se - Q wherein R is alkyl, aralkyl, alkaryl, aryl or a heterocyclic ring system and Q represents -Se-R' or -S-R' wherein R' has one of the significances given for R, halogen, cyano, or WHEREIN EACH OF R1, R2 and R3 is alkyl, aralkyl or aryl and X<-> is an anion but does not exist when R itself contains an anionic group. The selenium compounds increase the speed of the direct-positive silver halide elements. |
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Bibliography: | Application Number: DE19712113346 |