I left mine bubbling over the winter. It is now a dark green and very opaque. On the other hand, I have not etched a new board in quite some time, so I don't know if it has gotten better or worse. But before I left it bubbling, the fresh hydrogen peroxide and hydrochloric acid solution, even after heating in the microwave, was still very slow. Mike
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RE: RE: Re: CuCl etchant - an update
2013-09-04 by <mbushroe@...>