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<p>[QUOTE=&quot;sand, post: 7952655, member: 118540&quot;]If I remember correctly, both silver and bronze coins, will eventually be damaged, if they are contained in PVC soft plastic. PVC is Poly Vinyl Chloride. The &quot;chloride&quot; part, breaks down over time, and combines with hydrogen, from water in the air (H2O), creating hydrochloric acid (HCl), which damages the coins, and creates a light green substance, sometimes sticky, on the surface of the coins. It may start, as a clear, sticky substance, which people sometimes don&#039;t notice, because it&#039;s clear. As time goes on, it eventually turns green. I think, what I just said, is true, if I remember correctly. Someone please correct me, if this is incorrect.</p><p>I don&#039;t know, if the plastic sleeves, in the first 2 posts in this thread, are soft PVC, or stiff non-PVC.</p><p>Stiff non-PVC plastic flips (the SAFLIPS brand is supposed to be the best of these) are supposed to be a lot better than soft PVC. But I don&#039;t really trust those either, for long term storage of coins. I&#039;ve heard some people say, that some of the supposedly non-PVC flips, aren&#039;t safe either.</p><p>For my coins, I use Abafil cases and trays, for long term storage and display.[/QUOTE]</p><p><br /></p>

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