Direct-positive photographic material

Direct-positive photographic material with at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure, and a cyanine dye. The cyanine dye is a trinuclear cyanine dye of the formula where A1 = =(CH)- or =(CH-CH=CH)-, A2 = =(CH-CH)=, A3 = -(CH=CH)-, Z1 =...

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Bibliographische Detailangaben
Hauptverfasser:	ROLF STEIGER, JEAN FRANCOIS REBER
Format:	Patent
Sprache:	eng ; ger
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:	Direct-positive photographic material with at least one layer which contains a silver halide emulsion surface-fogged by chemical means or by exposure, and a cyanine dye. The cyanine dye is a trinuclear cyanine dye of the formula where A1 = =(CH)- or =(CH-CH=CH)-, A2 = =(CH-CH)=, A3 = -(CH=CH)-, Z1 = a nitrogen-heterocyclic radical with a single positive charge on the nitrogen atom and, Z2 = a radical mesomeric with Z1 and uncharged on the nitrogen atom, at least one of the radicals Z1 containing a betaine-type structure, and it being possible for the cyanine dyes to be neutral or positively or negatively charged corresponding to the sum of the charges and, in the two latter cases, containing a corresponding counterion.