Mike, You do not need to etch BEFORE browning as the pattern witll come out as well with normal browning. I have tried Copper Sulfate and HCL/HNO3 BOTH AND CANNOT TELL THE DIFFERENCE IN FINAL PATTERNS AND RESULTS. The chemicals in your browning solution will do the "Etching"

Last edited by Stallones; 05/03/16 02:12 PM.