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<p>[QUOTE=&quot;cladking, post: 883835, member: 68&quot;]US mint sets were packaged in four layers of plastic up until 1985, I believe.&nbsp; The outer two layers are a hard and safe plastic but the interior two layer don&#039;t appear to be safe.&nbsp; They are very soft and very thin.&nbsp; Many coins in&nbsp; these sets are being ruined and collectors should take steps to save those which survive.&nbsp; </p><p><br /></p><p>It&#039;s already too late for the 1968-P penny as 100% of these are ruined.&nbsp; Most are pretty disgusting and only 7% look half dewcent and all of these have small carbon spots as well.&nbsp; </p><p><br /></p><p>The clad and nickels are affected differently by date.&nbsp; Worst are the &#039;69-D quarters which turn a very unattractive and mottled grey.&nbsp; The &#039;68 quarters turn dark but aren&#039;t too unattractive.&nbsp; &#039;71 to &#039;84 clads aren&#039;t as badly affected but the pennies can be pretty bad in a few cases.&nbsp; 1984-D one cent coins are going the same way as the &#039;68.&nbsp; </p><p><br /></p><p>Post-&#039;84 mint set packaging appears to be OK and is not composed of layers.[/QUOTE]</p><p><br /></p>

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