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<p>[QUOTE=&quot;Collect89, post: 2045086, member: 15445&quot;]One more thing my friend==&gt;</p><p>&nbsp;</p><p>It is important to select a 2-inch x 2-inch flip that is HARD (not SOFT) for long term archival storage.</p><p>&nbsp;</p><p>Soft flips can include a chemical compound that makes them soft &amp; flexible.&nbsp; That chemical compound will slowly out-gas over time.&nbsp; The chemical compound will get on the coin&#039;s surfaces.&nbsp; Initially, the problem may appear as a greenish colored slime on the coin&#039;s surfaces.&nbsp; Given more exposure time, the slime&#039;s pH will begin to eat-away at the coin&#039;s surface.&nbsp; This chemical compound is a plasticiser and the damage that occurs is commonly called PVC damage or PVC residue.&nbsp; (Acetone is a great solvent for removing PVC residue from a coin&#039;s surface).</p><p>&nbsp;</p><p>Hard plastic flips do not have the plasticiser.&nbsp; Unfortunately, the hard flips are brittle &amp; typically break into two pieces after they are folded &amp; unfolded a few times.&nbsp; All my coins are in hard plastic flips or contained in Mylar or some other hard plastic container (like the hard plastic 2x2 holder you depicted).&nbsp; <b>Hard plastic is good for long term storage</b>.</p><p>&nbsp;</p><p>If a 2x2 flip is very flexible &amp; if it smells like a new plastic shower curtain, then you should not use the flip for <u>long term</u> storage.&nbsp; Those soft plastic flips are fine for shipping coins or short term storage.&nbsp; Some dealers use the soft flips but remember that dealers are constantly moving &amp; shipping their coins.&nbsp; When the coin finds its final home, it should be put into a hard flip.[/QUOTE]</p><p><br /></p>

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