On Fri, Apr 2, 2010 at 7:09 AM, Russell Shaw <
rjshaw@...> wrote:
> Chris Maness wrote:
> > If you keep the Ferric Chloride in a container with a lid and add a bit
> of
> >> HCl every few months before a use, it will etch PCBs for years if you
> use
> >> air bubbler agitation. Better to keep it.
> >>
> >
> > That works for FeCl3 too? I thought that was just for CuCl2 solution.
>
> I don't know. It's just the brown stuff from the shop that eventually
> goes green after enough copper and airation.
>
>
Ahhh, yes. That is CuCl that is insoluble in water. If you can separate
that out and put into a separate container you can use it to etch after it
has been converted to CuCl2. To convert it, just aerate it with an air
stone until it turns emerald green. Or add hydrogen peroxide until it turns
green while agitating. It makes a great etchant that is rechargeable see:
http://members.optusnet.com.au/eseychell/PCB/etching_CuCl/index.htmlChris
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