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<p>[QUOTE=&quot;Oldhoopster, post: 2693958, member: 84179&quot;]Olive oil is good for removing dirt and organic materials encrusting a coin.&nbsp; Although it can be slow, I&#039;ve used it successfully on low grade, crusty ancients.&nbsp; Toning is caused by a chemical reaction between the atoms on the surface and the surrounding environment (sulfur for example).&nbsp; Olive oil will not remove the sulfides/oxides and other chemically bonded layers[/QUOTE]</p><p><br /></p>

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