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<p>[QUOTE=&quot;-jeffB, post: 1447378, member: 27832&quot;]Well, 14 years is a lot less time than 140 years. Especially when many of those 14 years were probably spent in air-conditioned, dehumidified comfort, which was rather harder to come by in the early 1900s. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p><br /></p><p><br /></p><p>Yup. Vegetable oils (and animal fat) are &quot;triglycerides&quot; -- molecules formed by joining one molecule of glycerine and three molecules of organic acids. These oils frequently contain a small amount of free acid; it&#039;s not terribly strong as acids go, but it doesn&#039;t take much to start attacking copper. There are frequently other damaging contaminants as well (damaging to coins, not so much to diners).</p><p><br /></p><p>Mineral oils are different chemically, and wouldn&#039;t attack metal the same way. I&#039;ll leave it to GDJMSP and BadThad to fight over what exactly they do or don&#039;t do to coins. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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