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Crystals forming in Sulfuric Anodize bath

We have just begun to notice white crystals being collected in the filter for the Type II Sulfuric anodize baths. We do not see any from the hardcoat bath. Does anyone have any idea what is causing them to form?

Joel A. Lipof
TRB/Andarn Electro Services - Paterson, New Jersey
2006

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