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<p>[QUOTE=&quot;desertgem, post: 756007, member: 15199&quot;]I have cardboard 2x2 holders over 25 years old, and all of the plastic with them is mylar film. If yours are not that old, they should be safe.&nbsp; Plastic 2x2 flips should be evaluated before long term storage. It is possible to buy a coin on ebay or elsewhere, put it into a safe holder, and then a short time afterwards see corrosion initiated by PVC before you bought it, and the damage continued in the safe holder since it was not humidity or gas tight. I dip newly obtained coins in an acetone rinse, allow to air dry, before I put it into&nbsp; a mylar flip. The downside to this is that you may find that someone used a method to reduce scratches or marks, and the acetone removed the wax. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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