Has anyone tried phosphoric acid for etching? I had some left over from a old hydroponics project and added about 30% acid with some 3% Medical hydrogen peroxide from the super store. It etched a small double-sided board in about 10 mins when warmed in a bath of hot tap water. It was colorless before the etching and after it was bright green. There were no fumes or issues as far as I could see and it looks viable as an enchant. Does anyone have any thoughts??
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phosphoric acid for etching
2003-04-28 by dsv1486