Black-and-white photographic developing composition and a method for its use

Black-and-white elements, such as radiographic films, can be processed rapidly using a black-and-white developing composition containing a hydroquinone developing agent, and specific amounts of sulfite and borate ions. Thus, the molar ratio of sulfite ions to borate ions is less than 20:1, and the m...

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Bibliographische Detailangaben
Hauptverfasser:	FITTERMAN, ALAN S, HAYE, SHIRLEYANNE E, HUSTON, JANET M, RACHEL, JOAN F
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:	Black-and-white elements, such as radiographic films, can be processed rapidly using a black-and-white developing composition containing a hydroquinone developing agent, and specific amounts of sulfite and borate ions. Thus, the molar ratio of sulfite ions to borate ions is less than 20:1, and the molar ratio of sulfite ions to the hydroquinone developing agent is from about 1:1 to about 2.5:1. The developing composition is effective, rapid and stable.