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<p>[QUOTE=&quot;SuperDave, post: 2236955, member: 1892&quot;]As long as there&#039;s oxygen, things are gonna react. That&#039;s why they call it <i>oxidizing</i>. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Chemical reactions don&#039;t need a chemist to happen, and the atmosphere - more or less in different decades and different places - can have a wonderfully odd mixture of chemical content. You ever notice how Seated coinage is so often found darkly toned? I&#039;ve the feeling that was to an extent due to the very industrial, sulfur-laden atmosphere in which many circulated back when we were a coal-burning country. Yet, Morgan Dollars kept locked away in bags - even though held in polluted cities - developed magnificent rainbow toning simply because the reaction was slowed down.[/QUOTE]</p><p><br /></p>

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