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<p>[QUOTE=&quot;johnmilton, post: 24727999, member: 101855&quot;]Most spots on gold coins are copper spots. They are the result of a less than perfect mixing of the copper alloyed with gold. It turns brown, just like the copper in a bronze cent. </p><p><br /></p><p>The spots on this piece are odd, however. They don’t look like the usual copper spots I have seen. It looks like some foreign material was on the flan when the coin was struck. </p><p><br /></p><p>This leads the reason why some modern gold coins, which are supposed to be .999 gold, have red spots. Could it be something the mint used to wash the planchets that was not fully rinsed?[/QUOTE]</p><p><br /></p>

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