DEVELOPING COMPOSITION FOR BLACK AND WHITE PHOTOGRAPHIC HALOGEN-SILVER MATERIALS Russian patent published in 1995 - IPC

FIELD: photographic materials. SUBSTANCE: composition has, g/l: developing substance 0.7-8; anhydrous sodium sulfite 40-120; anhydrous sodium carbonate 16-30; antifogging substance 0.1-6; benzimidazole bis-quaternary salt 0.005-0.1, and water - up to 1 l. Source of salt indicated above is compound of the general formula where B - H, CH₃; B₁ - H, Cl; n = 2-4; R - ethyl, octyl; X=Br^-,, CH₃-S(O)₂O^-,, CH₃-C₆H₄-S(O)₂O^-. Composition can contain additionally 1± 0,01 g/g g/g polyethylene glycol. In this case photosensitivity is increased by 30-50%. EFFECT: increased photosensitivity. 2 cl, 2 tbl