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<p>[QUOTE=&quot;Info Sponge, post: 772720, member: 20538&quot;]The more I read about this the more ignorant I feel.</p><p><br /></p><p>It&#039;s a common observation that after a coin has been dipped it will no longer tone attractively. What&#039;s the chemical/physical mechanism that makes the difference? Doesn&#039;t dipping remove flow lines and make the surface flatter, and if so why would that lead to gray toning instead of colorful interference?</p><p><br /></p><p>The path length difference depends on the angle of incidence, unless my thinking is thoroughly confused. So shouldn&#039;t all toning be iridescent? If the geometry is independent of the angle of incidence, why is there iridescent toning at all?[/QUOTE]</p><p><br /></p>

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