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<p>[QUOTE=&quot;GDJMSP, post: 762284, member: 112&quot;]Jim you know a thousand times more about the scientific properties of gold than I do. But there still is one very simple experiment that anyone can perform for themselves and see it with their own eyes.</p><p><br /></p><p>Buy a gold coin of .999 fineness - which is as pure as you are going to get it. Leave this coin exposed to the air for a couple years. Then go buy another, freshly minted gold coin, (of the same type and from the same mint) of .999 fineness. Place the two coins side by side and you will a color difference with your own eyes.</p><p><br /></p><p>Of course you could also look at any of the number of old gold coins, struck in pure gold and listed as being 1.000 pure, and see that they are toned. And not the entire coin either, but color variations within the coin itself.</p><p><br /></p><p>Now given that, if it is not toning, then what exactly should we call it ?[/QUOTE]</p><p><br /></p>

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