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Subject: Re: [Homebrew_PCBs] Etching Problem

From: DJ Delorie <dj@...>
Date: 2010-03-18

Is the H2O2 fresh? It breaks down over time, a solution that's been
mixed for a while won't have any H2O2 left in it, and HCl won't etch Cu
without an oxidizer.

Are you sure you used 30% H2O2 and not the more common 3% ?