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<p>[QUOTE=&quot;GDJMSP, post: 2269971, member: 112&quot;]What the OP is describing is something that is so common that it often escapes notice, that being that some coins tone, sometimes rapidly, and others simply don&#039;t - even when they are kept in the same environment. </p><p><br /></p><p>Now you could say that the differences were due to certain contaminants being on one coin and not on another because the coins came from different sources. And that sounds like a reasonable explanation. But how do you explain it when all of the coins came from the same original source, were all stored in the same way and in the same place, and yet some toned and some didn&#039;t ? Things become a bit more complicated then for then there are no &quot;reasonable explanations&quot;. Or at least no readily apparent ones.</p><p><br /></p><p>For example, let&#039;s say a collector buys a small bag of coins or roll of coins directly from the mint. And then stores them all in the same and same place, be it in an album, individual coin holders, or 2x2s, or whatever. And yet some of these coins tone, fairly rapidly, and yet others do not. </p><p><br /></p><p>And yes, this is an extremely common occurrence, and has been for over a century. And yet people still try to say - well this coin had this on it or that on it and that&#039;s why. And I understand why, it&#039;s because they can&#039;t think of any other reasonable explanation so they feel that must be it. </p><p><br /></p><p>Do I have an explanation ? No, not really, but there are several possibilities that come to mind. Perhaps it is due to the coin storage medium itself, the album, the individual 2x2s, or other coin holders like individual envelopes - perhaps some simply have more sulfur in them than others, perhaps some merely drew more humidity out of the air than others. I doubt any of could ever really know. BUt what we do know, and know for a fact, is that some coins do tone more rapidly than others. And even though <u>can be</u> because a given coin came from a different source, that is not always the case.[/QUOTE]</p><p><br /></p>

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