On Mon, 21 Feb 2011 17:29:51 -0800 (PST), you wrote:
>FR-4 doesnt have to be green colored? Correct ?
I've used black, good for displays, blocks light.
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>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 .. ??
I've used 4 parts peroxide to 1 part acid. Don't think it's
absolutely critical.
Harvey
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>Randy
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