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<p>[QUOTE=&quot;GDJMSP, post: 1821055, member: 112&quot;]You partially have the right reason, but you are thinking about it incorrectly.</p><p><br /></p><p>This is what the surface of a coin with luster looks like - /\/\/\/\/\/\/\/\</p><p><br /></p><p>this is what the surface of a coin with no luster looks like - _____________</p><p><br /></p><p>Which has more surface area ?</p><p><br /></p><p>It must also be understood that luster is extremely fragile. And the reason it is extremely fragile is because the tops of the peaks, (and that&#039;s all luster is, a series of peaks and valleys), are very thin and rough. It&#039;s almost like a single tiny particle of metal sitting on top of a pyramid shaped pile of similar tiny particles. And since the particles are so tiny and have rough surfaces they are very susceptible to the effects of toning.</p><p><br /></p><p>The surface of a coin without luster however has a surface where the particles of metal are much more tightly packed together, protecting each other from the air on all sides except the very top. And this creates a semi-smooth surface. Much like the flat line I used in the illustration above. That simple illustration really explains it all and proves my point.[/QUOTE]</p><p><br /></p>

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