Homebrew PCBs

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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