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<p>[QUOTE=&quot;desertgem, post: 1045764, member: 15199&quot;]Many plastics dissolve in acetone, and not just PVC. Dip a PCGS slab ( no PVC) in acetone and watch it melt <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" />&nbsp; If you use acetone in the presence of slabs or hard plastic type holders, you can get frosted surface where a drop may fall or splatter. I am not sure about air-tites, but I seem to remember damaging one when I used to use them years ago, maybe not. </p><p><br /></p><p>Unless the plastic bags say &quot; Do not use for food storage&quot;, I would be 99.999 % sure they have no PVC. The flame test is still a good one, but you don&#039;t have to burn the whole bag. Heat a needle up and touch it to the bag to melt a little on the needle and then put it back into the flame. If it burns green or greenish blue ( CHlorine), I wouldn&#039;t use it. Yes, you should use a platinum needle, but few have those around. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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