Message:

<p>[QUOTE=&quot;physics-fan3.14, post: 2354724, member: 19165&quot;]Luster comes from two effects - the movement of metal, as described, and the wear of the die. Over the life of a die, the luster will change. A proof coin early in the die&#039;s life will exhibit luster only from the movement of the metal as it is coined. Later in the die&#039;s life, there will be luster from the wear of the die as well. The reflective, polished surface of the die is worn off, leaving a diffuse surface (which we see as luster, as described elsewhere in this thread).[/QUOTE]</p><p><br /></p>

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