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<p>[QUOTE=&quot;GDJMSP, post: 173447, member: 112&quot;]The last sentence in my previous post - &quot;Unless of course it is stored in a completely airtight holder - and to the best of my knowledge no such thing exist.&quot; - that includes mint holders. So no, they are not airtight.</p><p><br /></p><p>As for platinum, to be honest my experience with the metal is so limited that I can&#039;t say one way or the other. I do know this however, most will say the pure gold does not tone. But I have seen pure gold tone and it is not uncommon at all. So I rather suspect the same is true of platinum.[/QUOTE]</p><p><br /></p>

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