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<p>[QUOTE=&quot;rlm&#039;s cents, post: 2188491, member: 7957&quot;]If you want the technical answer, it is none of the above.&nbsp; PVC is actually perfectly safe, but it is brittle.&nbsp; In order to make it more pliable, they add a plasticizer.&nbsp; That is the problem.&nbsp; It migrates out of the PVC and onto the coin.&nbsp; It is hydroscopic (i.e. it attracts water).&nbsp; The water makes hydrochloric acid which eats the coin.&nbsp; Copper makes it green.&nbsp; However, before it turns green, it forms a haze on the coin.&nbsp; The haze can be removed usually without any damage.&nbsp; The green says there is definitely damage.[/QUOTE]</p><p><br /></p>

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