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<p>[QUOTE=&quot;Kentucky, post: 4586929, member: 33176&quot;]Chemistry stuff...the plasticizer for PVC is dioctyl phthlate (DOP).&nbsp; This is a very thick oily substance that gets between the polymer chains of the PVC and allow them to slip over each other, making it a pliable polymer.&nbsp; The DOP is a colorless liquid, however, it isn&#039;t very volatile, so it&#039;s going to stick around awhile and entrap other substances the coin might encounter and hold them close to the coin&#039;s surface.[/QUOTE]</p><p><br /></p>

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