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<p>[QUOTE=&quot;JeffC, post: 7447247, member: 90913&quot;]I think it&#039;s a combination of ambient storage environment, the metal composition and surface conditions, and the inside of the slab.&nbsp; If <i>many</i> of your slabbed coins are toning badly, then it could be something in the storage environment.&nbsp; But sometimes, it&#039;s just something with the coin and/or slab.&nbsp; I have this one (below) as part of a 4-coin set.&nbsp; All the other 3 are still perfect, whereas this one has a milk spot near the horse&#039;s tail.&nbsp; Fortunately it&#039;s not glaringly apparent (I just took this photo from the worst possible angle to highlight the spot) and, since I noticed it about 2 years ago, it hasn&#039;t gotten any worse.</p><p><br /></p><p>[ATTACH=full]1291640[/ATTACH][/QUOTE]</p><p><br /></p>

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