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--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> It's not oxyGEN you need, it's an oxiDIZER you need. Bubbling oxygen
> through the solution can re-oxidize the chemicals that are there (such
> as with CuCl etchant), but oxygen alone isn't enough to work with plain HCl.
>