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<p>[QUOTE=&quot;-jeffB, post: 1154991, member: 27832&quot;]Yes, olive oil can contain acids as impurities. Even if it doesn&#039;t, though, they can form over time.</p><p><br /></p><p>Vegetable oils (and nut oils, animal fats, any other oil that comes out of a living organism) are made of organic acids combined with glycerol (glycerine). As long as they&#039;re combined that way, and <i>pure</i>, they&#039;re quite neutral (neither acidic nor alkaline).</p><p><br /></p><p>With time and exposure to air and moisture, though, they can break down. &quot;Unsaturated&quot; oils -- olive oil, most vegetable oils, and even some animal fats -- can combine with oxygen to form reactive chemicals. And if something causes the organic acids to separate from the glycerol, they can certainly attack metal. (One of the simplest organic acids, acetic acid, works just dandy for restoring dates on Buffalo nickels, even diluted to 5% concentration -- as vinegar.)</p><p><br /></p><p><b>Mineral</b> oil is a different chemical entirely, and is not subject to this kind of breakdown (again, as long as it&#039;s not contaminated).</p><p><br /></p><p>BadThad, please check my work here...! <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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