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<p>[QUOTE=&quot;Detecto92, post: 1685178, member: 75105&quot;]You pull a BU indian head cent out of a yellow envelope. The coin was mint red when it was put in the envelope 30 years ago, it&#039;s now toned quite nicely.</p><p><br /></p><p>But what if you pulled the coin out 20 years ago? Would it of looked the same 10 years sooner? </p><p><br /></p><p>So the question is, is toning a slow process, or a fast process, that just takes time for all the conditions to be met?</p><p><br /></p><p>Does a coin tone in a matter of minutes inside the envelope once it&#039;s &quot;just right&quot;?[/QUOTE]</p><p><br /></p>

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