Ewesly / Holographic Formulae / GP 431

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Bleach solution

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: <a href="NickAdvances.PDF" title="The Origins of the Dreaded PBQ" target="_new">N. J. Phillips, A. A. Ward, R. Cullen, D. Porter, "Advances in Holographic Bleaches," Photographic Science and Engineering 24, 120 (1980). </a>

Also: <a href="../Developers/AgfaBrochure.PDF" title="Second Edition of the brochure" target="_new">Agfa Gevaert Technical Information Bulletin 21.7271(480).</a>

<a href="AgfaBrochure.PDF" title="More uselessness!" target="_self"></a>