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<p>[QUOTE=&quot;Bacchus, post: 49992, member: 759&quot;]An excellent answer.&nbsp; If I understand what you’re saying:&nbsp; the secret ingredient here is the luster.&nbsp; As you’re describing it, the luster is a radial network of <b>delicate </b>ridges which, when rubbed with something softer (or harder), are getting <i>broken down </i> and/or crushed (and not technically “scratched”), but the <i>appearance </i> is that of scratches because of the patterns of the broken ridges.</p><p><br /></p><p>I feel better now; my geology teacher wasn’t lying to me.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>All of this implies that a coin <i>without </i>luster would not be “scratched” by a soft cloth in the way that a coin <i>with </i>luster would be.&nbsp; Am I still on the right page here ?[/QUOTE]</p><p><br /></p>

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