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<p>[QUOTE=&quot;Insider, post: 3520707, member: 24314&quot;]<span style="color: #660033">Nice discussion.&nbsp; Unfortunately, I was not a CT member when it first appeared in 2009 as I would have added a few comments.&nbsp; </span></p><p><br /></p><p>vrt, asked:&nbsp; &quot;<b>What is coin luster?&quot;&nbsp; </b>He saw two options:</p><p><br /></p><p>1. <b><i><span style="color: #b30000">Luster is the specific diffusion of light.</span></i></b> This option is supported by the <b>mint&#039;s definition: </b>&quot;the dull, frosty, or satiny shine found on uncirculated coins.&quot; Discussion of different types of luster also based on this definition.&nbsp; <span style="color: #660033"><b><i>PERIOD!</i></b></span></p><p><span style="color: #660033"><br /></span></p><p><span style="color: rgb(102, 0, 51)"><i>A</i></span><span style="color: #660033"><i>dditionally: In virtually every definition of luster, the </i></span><i><span style="color: #b30000"><b>reflection of light</b> </span></i><b><span style="color: rgb(179, 0, 0)">from an object&#039;s surface is what causes the luster.&nbsp; </span></b></p><p><b><span style="color: rgb(179, 0, 0)"><br /></span></b></p><p><b><span style="color: rgb(179, 0, 0)"><i>THE CONDITION OF THAT SURFACE</i> </span></b><i><span style="color: #660033">will both modify and determine the <b>QUALITY </b>OF THE LUSTER we observe reflected from that surface.&nbsp; </span></i></p><p><br /></p><p><span style="color: #660066"><i>While this statement is true</i>:</span> &quot;This option has a dangerous effect - if your coin is locked in a safe you cannot say it has any luster - there is no light diffusion without the light.&quot; <i><span style="color: #660066">It is unnecessary as there is NO LIGHT involved - the &quot;thing&quot; necessary to bring out the luster. This is also t</span></i></p><p><br /></p><p>2. luster <span style="color: #b30000">is the irregularities on the coin surface </span>that cause the specific diffusion of light. <i><b><span style="color: rgb(179, 0, 0)">NO!&nbsp; </span></b><span style="color: #660033">Luster is the <b>specific quality</b> of the reflected light <b>FROM</b> the coin&#039;s surface!&nbsp; The rest of this member&#039;s post is more of his thoughtful opinion,&nbsp; Hopefully, he will change it so I&#039;m deleting it from my comments.&nbsp; &nbsp;&nbsp; </span></i></p><p><i><span style="color: #660033"></span></i>[/QUOTE]</p><p><br /></p>

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