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<p>[QUOTE=&quot;BadThad, post: 520345, member: 17261&quot;]You have to realize no chemical is 100% pure, no matter how hard you try to refine something, there will ALWAYS be impurities. Mineral oil is petroleum-based, perhaps one of the most difficult materials to purify....consider the starting material. </p><p>&nbsp;</p><p>My biggest concern with oil is sulfur, it&#039;s probably the best solvent for dissolving elemental sulfur and I guarantee you, no matter how good the mineral oil is, it WILL contain trace amounts of sulfur. Sulfur is particularly good at discoloring a coins surface over time, depending on concentration. This is true even if oxygen is not present. It&#039;s not a matter of if, but when will it happen. </p><p>&nbsp;</p><p>While your theory seems well founded....i.e. air vs oil, I will take my chances with air any day over oil. Airtite holders are very, very good. The seal is excellent and the permeability of the material is extremely low. The probability of seeing surface corrosion either form or continue while protected from air is virtually nil. Compounds like verdigris (sulfate and carbonate types) are highly dependant on two things to &quot;grow&quot;, oxygen and water . Removal of those &quot;feed&quot; materials will stop verdigris and most any other type of corrosion.</p><p>&nbsp;</p><p>Great discussion, thanks for the topic. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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