Fry's reagent
Classical etchant for plain carbon and low-alloy steel: 40 g cupric chloride (CuCl2) + 90 mL concentrated HCl + 100 mL water. The workhorse reagent for restoring serial numbers on firearm frames, engine blocks and machinery.
Classical etchant for plain carbon and low-alloy steel: 40 g cupric chloride (CuCl2) + 90 mL concentrated HCl + 100 mL water. The workhorse reagent for restoring serial numbers on firearm frames, engine blocks and machinery.
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