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Subject: Re: [Homebrew_PCBs] sluggish etchant

From: DJ Delorie <dj@...>
Date: 2008-06-17

"Leon" <leon355@...> writes:

> What concentration is the H2O2 you are using?

It was the usual 2 parts 3% H2O2 to 1 part 37% HCl. But like I said,
it's been sitting for a while.