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<p>[QUOTE=&quot;GDJMSP, post: 3067216, member: 112&quot;]It&#039;s not that the plastic imparts toning to the coins, it&#039;s merely that it does not prevent it, it still allows it to happen. In other words, the plastic isn&#039;t doing anything except reducing the amount of air flow that can get to the coins.</p><p><br /></p><p>There&#039;s kind of a caveat that goes along with this one though - what I said above is true of the clear plastic. But the colored plastic variants of these holders, whether it be black or white or red or whatever, those are known for causing toning.</p><p><br /></p><p>Now that&#039;s not to say that they will absolutely cause it every single time, but merely that it happens a whole lot more often than it ever does with the clear ones.[/QUOTE]</p><p><br /></p>

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