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<p>[QUOTE=&quot;ToughCOINS, post: 2779212, member: 20480&quot;]Ahh, another subject on which we&#039;ll have to agree to disagree Doug.</p><p><br /></p><p>Luster is a perceived quantity, as it is affected not only by material, surface finish and surface area, but also by the angle of incidence and the viewing angle.&nbsp; You can look at a coin with the light over your shoulder, and again with the light shining at the edge of the coin, and get entirely different perceptions of the coin&#039;s luster.</p><p><br /></p><p>Luster is reflected light, measured in quantity of light (lumens), and not the intensity thereof (as in lux or lumens per meter squared).&nbsp; This is exemplified in our industry by distinctly separate references to the amount of luster and the intensity of luster on a coin&#039;s surface.&nbsp; If the total area of the reflective surface increases due to furrowing the surface, while the intensity per unit area decreases, there might well be no net gain or loss in total reflected light at all. </p><p><br /></p><p>I am unaware of any conclusive research on a net reduction in total luster attributable to the erosion of coining dies, or other similar changes in surface finish.[/QUOTE]</p><p><br /></p>

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