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I don't have time to type it but here's the reason. :arrow:

It has nothing to do with penetrating the plate. It works because high current in the proximity of the anode converts concentrated sulfuric acid to persulfuric acid. That dissolves the gold. As the gold migrates away from the anode (the part(s) being stripped), the electrolyte reverts back to sulfuric acid, which can not hold gold in solution, so it precipitates as colloidal gold---the black substance that darkens the electrolyte.

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=86&t=11453&p=112263&hilit=sulfuric+acid+gold+cell#p112263

[QUOTE="Palladium, post: 118621, member: 1666"] I don't have time to type it but here's the reason. :arrow: It has nothing to do with penetrating the plate. It works because high current in the proximity of the anode converts concentrated sulfuric acid to persulfuric acid. That dissolves the gold. As the gold migrates away from the anode (the part(s) being stripped), the electrolyte reverts back to sulfuric acid, which can not hold gold in solution, so it precipitates as colloidal gold---the black substance that darkens the electrolyte. http://goldrefiningforum.com/phpBB3/viewtopic.php?f=86&t=11453&p=112263&hilit=sulfuric+acid+gold+cell#p112263 [/QUOTE]

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