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<p>[QUOTE=&quot;-jeffB, post: 2786214, member: 27832&quot;]Because how many would they sell if they <i>didn&#039;t</i> say that?</p><p><br /></p><p>If all they&#039;re sending through the coin is electromagnetic waves, I want to see how they can &quot;read past&quot; a silver coating to distinguish silver-coated copper from solid silver. I can imagine techniques that <i>might</i> let them do it, but I seriously doubt that they can distill that down into a reliable &quot;yes/no&quot; (or, given what I&#039;ve seen about the machine, a 0-100 readout with a guide that says &quot;any reading in this range is solid silver&quot;).</p><p><br /></p><p>But, again, I don&#039;t have the machine and test pieces in hand, so I could be wrong.</p><p><br /></p><p>Note that the thread I linked describes the machine getting confused about gold composition. <i>Maybe</i> the US mint silently changed the composition of commemorative half-eagles, making each contain more gold than advertised -- but I think the more likely explanation is &quot;the Sigma isn&#039;t perfect&quot;.[/QUOTE]</p><p><br /></p>

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