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<p>[QUOTE=&quot;Boss, post: 520388, member: 15110&quot;]Thad- I had read several chemical anaylsis articles discussing the break down of oils and particularly oxidation and sulfur reactions with mineral oil.&nbsp; They stated reactions like this only occur with extrememly high temps.&nbsp; Also based my conclusion on Mr Whites book &quot;Coin Chemistry where coins notedly toned in air-tites in acclerated sulfur environments.&nbsp; Kointain and NGC holders toned the least.&nbsp; The oil cuts off both air and water and that&#039;s why I feel they won&#039;t devlop verdigris or tone (trace sulfur may be bound to oils but it rendered inactive).&nbsp; The articles I read supported this idea.&nbsp; I will find and post later and maybe you could comment.&nbsp; Appreciate your feedback.&nbsp; I am open to the idea I could be wrong![/QUOTE]</p><p><br /></p>

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