Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] Re: Sponge etching with HCl and H2O2?
From: DJ Delorie <dj@...>
Date: 2011-11-28
Heh. In the USA, lab-grade HCl is expensive, but concrete cleaner
(exactly the same chemical!) is dirt cheap. I can buy etchant for
pennies a board, if I know where to buy it...