Ewesly / Holographic Formulae / GP 432
50 g Potassium Bromide
1.5 g Boric Acid
2 g p-Benzoquinone added just before use.
One litre water
Bleaching time: One and a half times the time it takes to clear.
Temperature: 20C Agitation: Intermittent
Shelf life: Not long with the PBQ added.
This bleach never seemed to work for me. Don't even bother.
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="A useless formula!" target="_new"> Agfa Gevaert Technical Information Bulletin 21.7271(480).</a>