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<p>[QUOTE=&quot;CamaroDMD, post: 4588143, member: 5233&quot;]So recently, I was examining a mint set of mine from 1970 and I noticed on the Philly coins a sorta swirling greenish pattern to it.&nbsp; At first, I thought it was PVC residue but it is totally flat and on the coin.&nbsp; When I tilt the coin I see a nice gold/pink toning to the coin but at most angles it is an ugly greenish swirling pattern.&nbsp; I took photos but of course I don&#039;t have them with me at work...I can post later if needed.&nbsp; </p><p><br /></p><p>Based on photos I have seen, I don&#039;t think it is PVC related (it&#039;s totally flat and doesn&#039;t appear growth like) but I pulled the quarter out (because I want it for a book) and gave it a good acetone soak...three baths over a day and nothing changed.&nbsp; </p><p><br /></p><p>But...this situation made me wonder.&nbsp; Do older (not that 1970 is old for any of you &quot;not older&quot; folks here) mint set plastics contain PVC?</p><p><br /></p><p>I did an internet search and I found a couple other posts on other forums that hinted that US sets never have but some world mints have.&nbsp; I tried to do a search here but couldn&#039;t come up with a specific enough search to give me the results I was looking for.&nbsp; So, I thought I would ask.</p><p><br /></p><p>My inkling is that they do not as we don&#039;t see PVC damaged mint sets from the 70s left and right...but I thought I would ask just to be certain.[/QUOTE]</p><p><br /></p>

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