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<p>[QUOTE=&quot;Conder101, post: 2482733, member: 66&quot;]Bingo.&nbsp; Copper is reactive.&nbsp; when it reacts with things in the air it forms copper compounds.&nbsp; Most copper compounds are green or blu-green.&nbsp; when the acetone and white cotton swab are used on the copper coin some of the copper compounds get picked up by the white cotton and a green or blu-green color is seen.&nbsp; Has nothing to do with PVC or PVC plasticizer residue.&nbsp; Just natural copper oxidation.&nbsp; I haven&#039;t seen a 2X2 with a PVC film window in over forty years, and they were old 2X2&#039;s then.[/QUOTE]</p><p><br /></p>

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