Re: gEDA-user: DJ's PCB making procedure

[John Griessen <john@xxxxxxxxxxxxxx>]

DJ Delorie wrote:

> Except that I *don't* drain it - that's the best part of CuCl is that
> it's air regenerated, there's NO waste at all.  The copper in solution
> came from other boards I'd etched (you start with an HCl/H2O2 etchant
> and slowly convert it).


Right.  If you do enough CuCl etching to grow your solution,
just separate the unwanted part, add lye until pH is 9
and the copper comes out as metal you can sell plus alkaline water
that's OK to put on the ground, or can be neutralized with a little vinegar.

John G

-- 
Ecosensory   Austin TX


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