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<p>[QUOTE=&quot;desertgem, post: 3045391, member: 15199&quot;]At least you should know that polyethylene film containers are a different organic molecule than Polyvinylchloride&nbsp; ( PVC). PVC is a hard plastic ( like the white PVC water pipes) that by ITSELF will not harm metal. But applications where it has to be transparent and flexible Plasticizers ( mainly esters) are added to do this. the plasticizers used can have different diffusion rates out of the PVC. Fast diffusion rate means it can form on enclosed metals as become corrosive ( this is what should be avoided with cheap PVC enclosures. The smell of the plasticizers is often called &quot;shower curtain&quot; smell. Some companies began to use PVC with low diffusion plasticizers that did not have that smell, but still could migrate over extended periods ( years). These were considered &quot;safe&quot;. Then flexible plastics began to be used ( more expensive than PVC based) such as polyethylene ( mylar) and polyproplylene ( used for baseball cards, comics, etc).</p><p><br /></p><p>The key is to plan to check occasionally for plasticizer gunk. It dissipates faster in moist hot climates to the sticky gel that reacts with coin metal. Acetone readily removes it without damage to the coin if used properly, and without damage to humans if handled properly.</p><p><br /></p><p>Be aware that many dealers ship coins in PVC flips as they do not scratch or rub the coins in transition to you, and they should always be removed, coins rinsed in acetone, and then put into a long term holder. People may own and drive a safe car, but if the people act dangerously, damage will still occur. IMO Jim[/QUOTE]</p><p><br /></p>

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