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

I just joined this group, and haven't read through the messages, but I thought I would throw my .02 cents in on this one.
As far as regenerating CuCl2 etchant, O3 works about as well as anything I've tried. Small tube style 03 generators aren't hard to make, assuming that one has any technical ability at all. The process goes faster if one uses O2 to feed the generator as opposed to air, but the method still works fine with regular air. A very small amount of HNO3 can be generated if the air used to feed the generator contains moisture, but HNO3 is a great oxidizer, and would only help the process in my opinion.