Mixed grain emulsions withsame grains but different speeds

A photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound. The compound is preferably a diphenyl disulphide. There is also cl...

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Bibliographische Detailangaben
Hauptverfasser:	FREDERICK CHARLES DERKS, JERZY ZENON MYDLARZ, ROGER LEE KLAUS
Format:	Patent
Sprache:	eng
Schlagworte:	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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Beschreibung
Zusammenfassung:	A photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound. The compound is preferably a diphenyl disulphide. There is also claimed a method of sensitising an emulsion by (1) adding a speed decreasing compound, (2) adding sensitisers and (3) heating the emulsion. The elements reduce the number of layers used in colour materials.