Etching Recipe
45% Copper Sulfate
45% NaCl (salt)
10% Sodium Bisulfate
Copper Sulphate is blue crystals - Root Kill
Sodium Bisulfate is PH Down used for swimming pools
How to Mix:
Mix with water to cover product, do not dilute too much. (Approximately 1 to 2 gal), it will be bluish green. When it turns clear after use it does not work well. It will take a while to dissolve crystals. It works better if it is room temperature or even warm. There will be a brown sludge formed, dispose of properly.
This recipe was in a recent Arizona Blacksmiths Association newsletter.