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<p>[QUOTE=&quot;-jeffB, post: 2366409, member: 27832&quot;]I don&#039;t know how closely heat-sealers regulate their temperature. Mylar apparently melts around 250C, but starts to decompose at 300C; when it decomposes, it can produce organic acids, which would certainly be bad for coins, even though they&#039;d exist in pretty small quantities.</p><p><br /></p><p>I&#039;d also want to make really sure that the coin is thoroughly dry and doesn&#039;t have any potentially damaging contaminants on the surface. An acetone dip would be a good idea. (This is for long-term storage; for just shipping a coin to a buyer, I can&#039;t imagine it would be worth bothering.)[/QUOTE]</p><p><br /></p>

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