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How to de-silver record stampers after electroforming

We have a small 45 rpm record plating operation and have lost our "recipe" for the solution to de-silver our stamper after the plating process is complete. we know the ingredients are chromic acid, sulfuric acid & distilled water. we just don't know how much of each to use to make 1 gallon of the solution. can anyone help?

Tom Dillander
plating operation owner - Shepherdsville, Kentucky
April 29, 2009

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