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