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<p>[QUOTE=&quot;calcol, post: 3288328, member: 77639&quot;]The atmosphere surrounding the coins is more important than temperature (within limits).&nbsp; Best atmosphere is none at all (vacuum) or an inert gas like argon or nitrogen ... not too feasible for most folks.&nbsp; Second best, is pure, dry air ... air free of water vapor, sulfur compounds, etc.&nbsp; Main generator of sulfur compounds around most coins is fiber ... paper, cloth, wood, cardboard, etc. Fiber may be good for your intestines, but it&#039;s not for your coins!</p><p><br /></p><p>So, best semi-practical preservation is coins in plastic (no PVC!) and stored in a glass or plastic chamber with desiccant and minimal amounts of fiber in the chamber.&nbsp; Really won&#039;t make much difference if it&#039;s 50F or 90F.&nbsp; However, if there are unreacted contaminants (like PVC plasticizer) already on the coins, a higher temperature will accelerate the nasty reaction.</p><p><br /></p><p>Happy New Year to All!&nbsp; May your first coin of 2019 be an unexpected cherry.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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