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<p>[QUOTE=&quot;GDJMSP, post: 1242317, member: 112&quot;]I agree with Mike that the underlying surfaces, meaning the type of luster, has a definite effect on toning. It can&#039;t help but to have an effect for that is the nature of refraction and reflection - which is all toning is. Or perhaps a better way of saying it would be to say which is why we see it in the first place. The thin film refracts the light and the luster reflects the light. And if the film is thick enough or heavy enough, then the light can&#039;t be refracted and reflected - and that&#039;s what we see as black.</p><p><br /></p><p>That said, there are exceptions to any rule. There are Proof coins (of all types) that have specific angle toning, and there are Proof coins (again of all types) that have multiple angle toning. The same can be said of business strikes. But the two things that always determine that are the thickness of the film and the luster. Which is what I said in the first place only I didn&#039;t use the word luster. Instead I said refraction and reflection&nbsp; - the film refracts, the luster reflects. And that is true in every case.[/QUOTE]</p><p><br /></p>

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