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Re: [Homebrew_PCBs] Re: Sponge etching with HCl and H2O2?

2011-11-28 by DJ Delorie

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...

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