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<p>[QUOTE=&quot;GDJMSP, post: 755546, member: 112&quot;]Yeah, nothing but water and an electrical cuurent. And that electrical current can and will pitt the coin.</p><p><br /></p><p>Same for sonic cleaning, it too is harmful to the coin.</p><p><br /></p><p>There is no method, none as in 0, that is not harmful to the coin except chemical cleaning. And even that is harmful to a degree for it removes a layer of metal. </p><p><br /></p><p>The only thing that makes chemical cleaning different is that even with that minute layer of metal removed, if done properly even a expert cannot tell it was done except by deductive reasoning. So chemical cleaning is the only accpetable method there is in the numismatic community. And then only when done properly.</p><p><br /></p><p>No matter what else you mention or dream up - the answer will remain the same.[/QUOTE]</p><p><br /></p>

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