On Tue, Apr 8, 2014 at 8:15 AM, <leeleduc@...> wrote:
>; I find that 9% Peroxide (30 Volume Clear Developer) is a good strength to use. The 27% is too aggressive for me. I can etch a 2X4 inch, 1 ounce board in about 1 minute using 9% H2O2 and a foam paint brush.