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<p>[QUOTE=&quot;Oldhoopster, post: 7989147, member: 84179&quot;]One detail to consider, the PVC doesn&#039;t cause the green slime residue, it is the plasticizer used to soften the PVC that reacts with moisture to form HCl.&nbsp; However, I don&#039;t know if they use an &quot;archival&quot; plasticizer on those flips (is there even such a thing?), so it&#039;s probably best to avoid any soft PVC.&nbsp; The SafFlips aren&#039;t that much more expensive and you can always use 2x2s for cheap coins (that&#039;s what I do).</p><p><br /></p><p><br /></p><p>I used to have the full chemical reaction written out, but the file got lost during computer changes over the last 20 years. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie20" alt=":banghead:" unselectable="on" unselectable="on" /></p><p><br /></p><p>Edit to add: I think the plasticizer has Cl in it too, so it would also give a positive reading on the test if the concentrations were high enough[/QUOTE]</p><p><br /></p>

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