Copper Sulfate is used to etch copper and brass with the E3 Etch Controller.
Mix with 12 oz. distilled water and reuse the solution after straining through coffee filter.
Keep away from children, follow safety precautions.
Etching update: ELECTROLYE SOLUTIONS: We recommend using 2X the amount of copper sulfate for etching than was included in the original kit We now include (4 spoonfuls) it makes the process much faster. If you use less copper sulfate it will still work, it just takes longer.
