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<p>[QUOTE=&quot;GDJMSP, post: 2441627, member: 112&quot;]I should have qualified my comment, yeah a coin without luster can tone, the common battleship grey for example, but they don&#039;t get colorful toning. And they can&#039;t, unless there is luster present. </p><p><br /></p><p>This why you very rarely see colorful toning on circulated coins - because the luster is gone. Yes, you might occasionally see bits and pieces of colorful luster here and there on circ coins, but if you look at therm, and think about it, it&#039;s always in the protected or semi-protected areas where wear has not destroyed the luster. </p><p><br /></p><p>Luster is necessary for colorful toning because colorful toning is only created by thin film interference and there can be no thin film interference if there is no luster.</p><p><br /></p><p>As for the copper, or copper coloring, being on the surface - if the coin was given a wash that&#039;s exactly where it would be.</p><p><br /></p><p>Now I&#039;m not saying I&#039;m absolutely right that the coin was washed, that&#039;s my opinion. And it is my opinion because I think that to be far more likely than that much copper being present on the surface of the coin because alloys just don&#039;t mix that way. Could they ? Yeah - but it would be a billion to 1 shot. Whereas a wash, from a coin doctor trying to get a polished coin that could not otherwise tone - to colorfully tone - by giving it a wash, that happens all the time.</p><p><br /></p><p>In other words, it&#039;s a probability thing. A billion to 1 - or a common occurrence ? Take your pick which is more likely.[/QUOTE]</p><p><br /></p>

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