Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I can't give specifics. Others have worked it out.

" The etch reaction is:
CuCl2 + Cu --> 2CuCl

Where CuCl2 is supposed to be bright green, and CuCl is brown muddy
stuff.

The "regeneration" reaction is:
CuCl + HCl + O --> CuCl2 + H2O
In my case the O is provided by bubbling air through the solution."

http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html#operate_acid
<http://members.optusnet.com.au/%7Eeseychell/PCB/etching_CuCl/index.html#operate_acid>

So I guess technically no. You are more or less using what is already
there to make more. The solution wouldn't be weakened. I would also
guess that eventually, you would need to start from scratch again though
due to impurities found on the board surface, dust or dirt getting into the
solution, etc.

As I have stated I've just started reading about this myself and am by no
means a chemistry major. But if the above listed reactions prove to hold
true then CuCl2 can indeed be salvaged and reused.

Herbert E. Plett wrote:

> --- William Kroyer <william.kroyer@...> wrote:
>
>
> > ... but I'm guessing it's "reguvinated" by simply adding
> > more HCl or H2O2.
>
> in other words: you are pouring more 'pure' etchant into the weakened
> solution!
>
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