On Mon, 21 Feb 2011 17:46:33 -0800 (PST), you wrote:
>oh .. can I mix and store this ? or is it a mix , use and discard ?
>and are there disposal issues ?
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Mix and store. After about 30 days, the peroxide goes and it will not
etch. Bubble air through it and that will regenerate it. Eventually,
I think you will need to add HCL to it. Etchant lasts a long while.
Turns green to CUCL etchant...
Look into the archives and there's links to a lot of good
documentation.
Harvey
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>________________________________
>From: Randy S. <rj3819@...>
>To: Homebrew_PCB <homebrew_pcbs@yahoogroups.com>
>Sent: Mon, February 21, 2011 8:29:51 PM
>Subject: [Homebrew_PCBs] FR-4 Copper Clad and Etchant mix
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>FR-4 doesnt have to be green colored? Correct ?
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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 .. ??
>
>Randy
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