I would have thought the HCl would (although it would not have dissolved the Copper) have perhaps cleaned off any Copper Acetate(WSDTY) coating on the Cu to give it the usual Cu color if the green color is resulting from any oxidization which has occurred to the Cu, but the HCl seemed to have no effect. I remember reading some time ago that one way to purify Copper metal is to electrolytically dissolve it and re-plate it out on to another surface. The Copper metal will be oxidized into solution and then be reduced back out at Cu metal, but the impurities will be left behind in a pile underneath the Copper anode. So this is what I think it occurring, you are basically plating over Copper from one electron to the other. The Copper ions which have not yet been plated over are causing the blue color of the electrolyte solution as a aqueous solution of Copper(II) Acetate is forming.

i saw one time you dissolve Copper Acetate in HCl and put an iron nail in it and it will plate it with copper. i tried it and it worked. I put 1500mA into it and it formed in 2 days with 5% acetic acid How would one go about drying a solution without burning it, besides evaporating at room temp?

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