FR-4 doesnt have to be green colored? Correct ? Other question .. for making etchant .. I saw 2 parts peroxide to one part muriatic acid ( 34% hydrochloric acid ) and I saw 3 to mix as well .. Is it crucial ? I mean I guess the only thing that it would change is the etching times .. and the fumes LOL .. ?? Randy
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FR-4 Copper Clad and Etchant mix
2011-02-22 by Randy S.