FR-4 isn't green, it's kinda beige. On commercial boards it's the
solder mask that's green (or red, or blue, or black, or white).
--Adam Shea.
On 2/21/2011 7:29 PM, Randy S. wrote:
> 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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