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<p>[QUOTE=&quot;desertgem, post: 1618728, member: 15199&quot;]Sine the OP says (1) that the metal of the coins aren&#039;t affected, and (2) that the color remains &#039;within&#039; the plastic, I would eliminate any PVC action, because the plasticizers of PVC are close to colorless until they react with copper or silver. Assuming the tubes are polyethylene products ( there is no recycle symbol on the bottom to indicate) my suspicion is it is from Chromium compound used in the polymerization process as a catalyst. Perhaps a contaminant slowly converted some to chrome oxide which is a similar green color.</p><p><br /></p><p><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Cr2o3_gruener_farbstoff.jpg/200px-Cr2o3_gruener_farbstoff.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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