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<p>[QUOTE=&quot;ToughCOINS, post: 25299186, member: 20480&quot;]Die wear decreases straight-on mirror reflectivity, and increases the swirling cartwheel luster produced by flowing planchet metal furrowing the surfaces of the dies.&nbsp; As those furrowed grooves in the dies deepen, the height of the corresponding ridges struck on the surfaces of the coin increase, so the reflective surface area of the coin increases, as does the resultant cartwheel luster.</p><p><br /></p><p>Cleaning the coin lops a little off the top of those ridges, and reduces the reflective surface area slightly.[/QUOTE]</p><p><br /></p>

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