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% ?
Message
Re: [Homebrew_PCBs] Etching Problem
2010-03-18 by DJ Delorie