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<p>[QUOTE=&quot;BadThad, post: 2616396, member: 17261&quot;]That&#039;s why chemistry is so interesting. Over time, PVC will degrade and form hydrochloric acid. A very strong mineral acid that will eat copper, silver, nickel, etc. Most coinage has traces of copper in it, that is what causes the greenish/blue color, the coin being eaten away. Even with a <i>thin film of PVC</i>, some metal has been removed. The damage only shows itself when it has removed enough metal to dull the surface.[/QUOTE]</p><p><br /></p>

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