My ferric chloride etchant was obviously exhausted, when I was etching a couple of small boards this afternoon, so I sloshed in some H2O2, reasoning that it would oxidise any cuprous chloride to cupric chloride - an etchant in its own right, and convert ferrous chloride back to ferric chloride. There was a lot of fizzing and the board finished etching in seconds. I had previously added some HCl to prevent sludge build-up. Leon -- Leon Heller, G1HSM leon_heller@... http://www.geocities.com/leon_heller
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H2O2 and ferric chloride
2003-07-02 by Leon Heller