Ewesly / Holographic Formulae / Kodak S-13

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Bleach solution

Part A:
2.5 g Potassium Permanganate
8 mL Sulfuric Acid or 24 g Sodium Bisulfate
One litre water

Part B:
10 g Sodium Bisulfite
One litre water


Don't mix the two together. Immerse the plate for one minute in Part A, then one minute in Part B, followed by a five to ten minute wash. The sodium bisulfite gives off quite a strong effluvia, respirators mandatory. It will remove the pyrogallol or pyrocatechol stain from holograms, or most any stain in the holographic darkroom's trays.

These baths can also be used as a reversal bleach, but they are temperamental.

Bleaching time: One and a half times the time it takes to clear if used as a reversal bleach.

Temperature:  20C              Agitation:  Intermittent

Shelf life: This stock solution lasts practically indefinitely.

Source:<a href="ReversalBleaching.PDF" title="Predates Pyrochrome" target="_new">R. L. Lamberts and C. N. Kurtz, "Reversal Bleaching for Low Flare Light In Holograms", Applied Optics 10, 1342 (1971)</a>