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<p>[QUOTE=&quot;GDJMSP, post: 86332, member: 112&quot;]You are quite correct - the gold alloy used for coins can and will tone at times. But for a comparison take a look at almost any US gold coin regardless of age. The majority of them are of 90% purity and seldom do you see toning. Once in a while yes, but usually only when there was a poor alloy mix.</p><p><br /></p><p>Older, 700 to 1000 years, gold coins from Europe and the middle east were normally of a surprisingly high purity - usually 98% and above. I don&#039;t study the ancients, but from what I have been told they were often of a high purity as well. And when gold approaches that level of purity rarely is any tarnish or toning seen.[/QUOTE]</p><p><br /></p>

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