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<p>[QUOTE=&quot;zach24, post: 1355913, member: 29975&quot;]I cannot find where I originally read the definition, but this one is very similar.</p><p><br /></p><p>[QUOTE/]&nbsp; Mint luster is formed during the minting process. The surface of the die that strikes a planchet has slight irregularities When the die strikes a blank planchet, metal flows into the recesses of the die and outward toward the rim. The irregularities in the die are reproduced on the surface of the coin, Moreover, the flowing metal the surface of the die with faint lines called flow lines. These flow lines become more pronounced as the die is used. The flow lines cause the formation of dials on the surface of the coin which fan out from the center and are most visible near the edge but are also visible near the raised design, letters, and date. The irregularities transferred from the die as well as the radials are readily observed under a microscope. The radials appear as tiny ridges and valleys When light strikes the surface of the coin; the Irregularities and radials, giving a soft diffuse appearance to tone coin&#039;s surface reflect it in all directions. This appearance is sometimes referred to as mint frost. [/QUOTE][/QUOTE]</p><p><br /></p>

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