Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

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Subject: Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2

From: DJ Delorie <dj@...>
Date: 2011-05-05

If you can see the pcb AT ALL in the solution, you don't have enough
etchant in it yet. Mine is so dark, it's basically black, and I can
only see the pcb if it's within 0.3 inches of the sides. I check the
color by taking a few drops out and checking that.