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<p>[QUOTE=&quot;Insider, post: 2527534, member: 24314&quot;][USER=73983]@jtlee321[/USER] thanks for the reminder...I&#039;ll take at least part of the credit for that one as I learned it in a beginners grading seminar taught by Skip Fazzari in the early 1980&#039;s and I posted his method on CT.&nbsp; Forgive me if I don&#039;t look back in 4000+ posts to find the date it was posted.&nbsp; I believe Fazzari also published that method in one his grading column in <i>Numsimatic News.</i>&nbsp; </p><p><br /></p><p>Let me add to your &quot;trick.&quot;&nbsp; Place a white sheet of paper on a table.&nbsp; Place an incandescent light source on one side of the paper (depending if you are right or left handed) - dark room a plus.&nbsp; Now, hold the coin opposite the light near the edge of the paper and cock it over at about a 45 degree angle.&nbsp; Place your head (without blocking the light) so you can see the downward side of the coin.&nbsp; The light from the lamp will travel down to the paper and be reflected up to the coin.&nbsp; Instantly you will see a color change anywhere the original surface is impaired.&nbsp; Normally an AU silver coin will turn gray at the rub.&nbsp; </p><p><br /></p><p>Now you&#039;ll need to decide if the change of color is due to stacking (market acceptable) or friction wear (not acceptable).&nbsp; Additionally, if friction, you&#039;ll need to decide how much friction you will allow on a coin before it becomes too much (AU) for your standards.&nbsp; With experience you will learn how much the TPGS allow before each type of coin and each metal they are made of becomes their AU.</p><p><br /></p><p>It is not as hard as it sounds.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />&nbsp; There is a good discussion of luster on a very old thread here: Cabinet friction, stacking or wear.&nbsp;&nbsp; That may be where I posted this trick.&nbsp; IMO, everyone on CT should read it![/QUOTE]</p><p><br /></p>

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