Ewesly / Holographic Formulae / GP 432

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Bleach solution

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>