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<p>[QUOTE=&quot;desertgem, post: 1536330, member: 15199&quot;]I agree that in the absolute sense Doug is correct as given long enough and the proper situation what he says can occur.</p><p><br /></p><p>I have many coins stored in 2x2 cardboard holders, and my largest problem has been the corrosion of steel staples over 30 years leading to toning/corrosion of coins in the mylar near it. A switch to stainless steel staples help a lot. But I have low moisture environment and very little environmental sulfur pollution. </p><p><br /></p><p>I do use the non-pvc flips,&nbsp; binder pages, and non-pvc 3 ring binders when I need such. The mylar flips can damage the coin with &quot;wear&quot; like damage on the edges of the coin( and the faces if you grab it that way and push the coin around) Only the cut edge of the plastic such as the opening or the seam has the surface that can scratch. the face of the plastic if dustfree, as dust ( silica {quartz, hardness of 7 MOH}) could scratch coin metal, so throw away anything dusty. Pop the opening so the coin enters without hitting it. I use a pulse heat sealer to seal the flip so staples aren&#039;t needed and dust can&#039;t get inside.</p><p><br /></p><p>There is a place for pvc flips, and that is if you are going to be passing a coin around such as at a show or club meeting. The softness of the pvc will help hold the coin inside and not allow it to slip out. Sometimes I do use a hard plastic holder, but I still tape it for the night as once you have a friend drop it on the floor and it pops open and the coin bounces, you will understand.</p><p><br /></p><p>Holders are important, but more than that, is that you recognize that although a holder can protect against direct physical damage, even the hard plastic holders can not protect against bad environmental conditions such as sulfur compounds or other chemicals&nbsp; in the air, dust particles, moisture, etc.&nbsp; A handful of sacrificial scrubbed copper plated cents will prevent much chemical damage as Intercept ( tm) products do.</p><p><br /></p><p>I am not debating the truth of Doug&#039;s 1,2,3~ just my own opinion for what it is worth <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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