Sorry, John. I misled you. It's actually here:
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http://www.thunting.com/cgi-bin/thunting/pages/go.cgi?go=do-it-yourself/electrolysis/index.shtml
It works very nicely and does hardly any damage to the base metal itself. In some cases, if you use copper sulphate as the electrolyte with a copper coin, it can fill in some of the pitting and make it prettier, but of course, less valuable. My personal theory is this. An unrecognizable lump is completely worthless. A coin that was buried inside and now visible and identifiable is worth 1000 times the value of the lump. One cleaned by electrolysis is even better.
I subscribe to the notion of never using abrasives or polishes on coins of value but electrolysis is a real benefit to a coin as long as you don't let it go too long.
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http://www.thunting.com/smf/index.php/topic,20883.msg138978.html#msg138978
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-GD
It's all about that magical moment of discovery when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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