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 _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user