EP 0267264 B1 19900725 - HIGH CONTRAST DEVELOPMENT OF PHOTOGRAPHIC ELEMENTS
Title (en)
HIGH CONTRAST DEVELOPMENT OF PHOTOGRAPHIC ELEMENTS
Publication
Application
Priority
US 86292186 A 19860514
Abstract (en)
[origin: WO8707039A2] High contrast development of photographic elements, such as lithographic films used in the field of graphic arts, is carried out in the presence of a hydrazine compound with an aqueous alkaline developing solution which has a pH of above 10 and below 12 and contains a dihydroxybenzene developing agent, an auxiliary super-additive developing agent, a sulfite preservative, and a contrast-promoting amount of a hydroxyalkylated piperidine compound. The developing solution combines the advantages of high capacity, a high degree of stability, and a long effective life, while providing excellent contrast and speed characteristics.
IPC 1-7
IPC 8 full level
G03C 5/29 (2006.01); G03C 1/06 (2006.01); G03C 5/305 (2006.01)
CPC (source: EP)
G03C 5/305 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8707039 A2 19871119; WO 8707039 A3 19871217; EP 0267264 A1 19880518; EP 0267264 B1 19900725; JP S63503247 A 19881124
DOCDB simple family (application)
US 8701008 W 19870504; EP 87903549 A 19870504; JP 50311487 A 19870504