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<p>[QUOTE=&quot;Paul M., post: 2182704, member: 73165&quot;]No.&nbsp; Slabs provide reasonable protection by themselves, but toning can still occur inside them.&nbsp; What I mean is you should store coins in an environment that&#039;s protected from airborne contaminants (sulfur is the primary enemy here).&nbsp; You should also try to provide a low-humidity, climate-controlled environment (the guideline here is that if it&#039;s comfortable for humans and there aren&#039;t wide swings in environmental conditions, it will be fine for coins).</p><p><br /></p><p>Roughly speaking, copper will be most sensitive to storage conditions, followed by silver coins in decreasing order of silver content (silver bullion coins being most sensitive down to 90%, 40%, and lower silver content for world coins), followed by gold, all the way down to platinum (the least reactive metal).</p><p><br /></p><p>You can never totally stop toning without going to extreme expense like constructing a hermetically sealed display case filled with dry nitrogen or something.&nbsp; And, storage is going to be more important in a high-humidity/high temperature environment like, say, Florida, than a low-humidity/moderate temperature environment like, say, most of southern California.</p><p><br /></p><p><br /></p><p><br /></p><p>Heh... you forgot to put a smiley to indicate sarcasm after your first sentence. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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