Homebrew PCBs

"Todd F. Carney / K7TFC" <k7tfc@...> writes:
> Responsible disposal is, of course, an issue.

The "waste" your trying to dispose of, is itself an etchant.  Save it,
eventually you'll have a Cupric chloride etchant that doesn't need to be
disposed of at all.

I made my etchant by mixing HCl and H2O2 in a big container, then
throwing in about half a pound of scrap copper and an air hose.  The
"waste" is a nice emerald green CuCl etchant that I've been using ever
since.