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<p>[QUOTE=&quot;Jaelus, post: 2900918, member: 46237&quot;]I don&#039;t know about copper, but from my collection of WWI/WWII era iron and zinc coins, the ones I have that survived in high grades did so stored in machine oil/mineral oil and wrapped in cloth or the like. Some are over 100 years old and look as struck, with no oxidation, and have not been dipped. I believe encasement in oil would count as an airtight storage method (though it needs to be cared for), and one that was historically available.[/QUOTE]</p><p><br /></p>

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