http://www.instructables.com/id/Sponge-Ferric-Chloride-Method-Etch-Circuit-Bo/ William Alford GI Motility Medical Research Page http://alford.grimtrojan.com/ [Non-text portions of this message have been removed]
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instructables 1 min PC etch using sponge & FeCl
2009-08-14 by William Alford