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Subject: Re: [Homebrew_PCBs] Sponge etching with HCl and H2O2?

From: DaveC <davec2468@...>
Date: 2011-11-26

>...
>HCl/H2O2 is very fast anyway, but it could probably be useful for CuCl2.
>
>Leon

-=-=-=-

I found it not so fast. I etched a 5" x 10" 1-sided board (consisting
of several duplicate small circuits) and it took almost an hour. I
started with a fresh batch, just enough etchant to cover the board
but added more as time dragged on.

Maybe my mix is wrong? I'm using 15 percent hcl (muriatic acid) and 3
percent h2o2 at a mix of 1:1.

What mix are you using?

Thanks,
Dave