On Sep 25, 2004, at 8:44 PM, Byron A Jeff wrote:

> Already had the medical H2O2 at home (1 quart).
>  It didn't seem to be enough.

Really?  You should only need a bit of H2O2 to get things started.
Once you get 'some' CuCl2, that should act as an etchant as well,
as long as you continue to bubble air through it.  It does take
quite a while; I spent several days tossing in copper and letting
it aereate overnight or until the copper was gone.  Copper wire is
pretty thick by PCB standards.  You can go faster with concentrated
HCl and strong H2O2, but that's not necessarily the point..

(you keep adding copper till the copper doesn't disolve, even with
the aereation.  I got a nice light-bluegreen power precipitating, which
I suspect was copper oxychloride.  The usual "spent etchant" for this
stuff is brown sludge; so if you're not getting brown sludge, you can
keep adding more copper.)

BillW

_______________________________________________
http://www.piclist.com
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist