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<p>[QUOTE=&quot;KurtS, post: 2252461, member: 11786&quot;]Tarnish wouldn&#039;t affect it by much if any fraction of a %, but I strove for standard results. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />&nbsp; All told, the discrepancies for silver coins were unexpected. A friend also tested a bunch of control sample bronze/Al/CuNi coins, getting expected results. Then he tested an 2914 ASE, and got a reading suggesting close to .999 purity. Perhaps he will test more silver coins and share his results here? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>For my results above, I should note the vertical scales on the graphs for the control group and the silver group are different.&nbsp; Below is the silver group adjusted to the same vertical scale as the control. It&#039;s pretty clear there&#039;s something going on when silver coins are involved.</p><p><br /></p><p><img src="https://c2.staticflickr.com/6/5763/21550568223_f9e63a0fc7_b.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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