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[quote]QUOTE: from nw611 (used a black permanent Magic Marker, works great) [/quote] Don't get rubbing or denatured alcohol on them as alcohol will take permanent magic marker off. When I make a printed circuit board I use a permanent marker to draw the tracings, after etching, denatured alcohol or rubbing alcohol which is 70% denatured is used to wipe off the permanent marker leaving the copper tracings.
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