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<p>[QUOTE=&quot;desertgem, post: 663288, member: 15199&quot;]It is actually the PVC plasticizers that can become airborne and affect a coin not in direct contact with the PVC.&nbsp; This is prevented by minimizing the amount possible in the air. Any holder that reduces exposure will aid in preventing PVC damage. This includes a stapled 2x2 cardboard holder at the low end and vacuum sealed inert plastic at the high end. However, there may be problems of storage related to all ( yes, even air-tite(tm) and intercept (tm)&nbsp; products. </p><p><br /></p><p>&nbsp;&nbsp;&nbsp; The Largest problem by far is the collector. Often expensive solutions are utilized, but then they are put away in an environment such as a SDBox for extended periods with out checking for small cracks, punctures, manufacturing defects, and improper installation and closure, and environmental gas factors. </p><p><br /></p><p>&nbsp;&nbsp; Damage is done by the plasticizers forming chemical reactions on the surface of the coin. A very inexpensive &quot;PVC damage detector&quot; can be made by finding a correct size CD jewel case that will hold a couple of cents, and punch with heated nail held in pliers a few times to give air holes. Then prepare a couple of &quot; sacrificial cents&quot; by taking some BU [ NON VALUABLE POST 1982 COPPER PLATE&nbsp; CENTS] and abrasively clean until you can see the cleaning lines, rinse and dry well, and put into the case and close it.&nbsp; Now, any environmental gases that come into your SDB or other storage case, area, album, etc. etc. will attack this raw copper metal quicker than your &quot;real&quot; coins. Ever so often , check the &quot;detector&quot; and see if they are still bright and shiny, or are become colorful. If severe, reconsider your storage methods. You can use a small silver bullion coin also the same way. I have one in a small hard plastic mini-case, I found some place, that barely holds one cent, but it can be put into an old fashion cardboard album. These detectors are also providing intercept{tm} type protection by reacting with the gases for far less price.&nbsp; For those who wonder about toning environments ( for long term &#039;natural toning&#039;) these detectors also tell you if an old album is outgasing well enough to produce a toning environment. Not advocating this use, but I am sure it occurred to you.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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