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<p>[QUOTE=&quot;mycohopper, post: 992815, member: 21377&quot;]Google or search these forums for &quot;artificial toning&quot; (AT). Coins tone naturally (and unnaturally) by coming into contact with sulfides, mainly from paper products. I recommend searching this topic because any one of us here that&#039;s familiar with toning could write an entire book about the subject - regarding both the good/bad and intentional/natural aspects of it.[/QUOTE]</p><p><br /></p>

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