GP 431

300 mg Phenosafranine
150 g  Ferric Nitrate
 33 g  Potassium Bromide
 One litre water

Dilute 1 to 4 with water before use.

Bleaching time: One and a half times the time it takes to clear.

Temperature:  20C              Agitation:  Intermittent

For rehalogenation after fixing.  Hans Bjelkhagen prefers this over the simpler GP 431 formulation for pulsed masters developed in Neofin Blau diluted 1:1.

Shelf life: This stock solution lasts indefinitely, working solution about one week.

Source: N. J. Phillips, A. A. Ward, R. Cullen, D. Porter, "Advances in Holographic Bleaches," Photographic Science and Engineering 24, 120 (1980).

Also: Agfa Gevaert Technical Information Bulletin 21.7271(480).