PHOTOGRAPHIC DEVELOPING COMBINATIONS

1,154,385. Photographic silver halide development. GEVAERT-AGFA N.V. Oct. 18, 1967 [Nov. 4, 1966], No.49658/66. Heading G2C. [Also in Division C4] An exposed photographic silver halide emulsion layer is developed with a mixture of developing agents comprising an anionic developing agent, e.g. hydroq...

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Bibliographic Details
Main Authors GEORGE FRANS VAN VEELEN, ANTOON LEON VANDENBERGHE, JOZEF FRANS WILLEMS
Format Patent
LanguageEnglish
Published 16.02.1971
Subjects
AUXILIARY PROCESSES IN PHOTOGRAPHY
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES
PHOTOGRAPHY
PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES
PHYSICS
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Summary:1,154,385. Photographic silver halide development. GEVAERT-AGFA N.V. Oct. 18, 1967 [Nov. 4, 1966], No.49658/66. Heading G2C. [Also in Division C4] An exposed photographic silver halide emulsion layer is developed with a mixture of developing agents comprising an anionic developing agent, e.g. hydroquinone or a derivative thereof and 1-phenyl-3-pyrazolidinone, and a bis(pyridone) azine developing agent of the formula:- where R 1 and R 2 are each substituted or unsubstituted alkyl or aralkyl, n and n1 are each 0 or 1 and Z 1 and Z 2 each represent the atoms necessary to complete a substituted or unsubstituted pyridone nucleus. The developing agents may be present in the developer and/or the light sensitive material and/or an image-receiving material for the silver salt diffusion process.
Bibliography:Application Number: USD3563747