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<p>[QUOTE=&quot;-jeffB, post: 1358728, member: 27832&quot;]I really, really need to start tinkering around with that. Electrically, there&#039;s a pretty big difference between 90% silver and CuNi; something <i>like</i> a metal detector, a coil that you pass the roll through, ought to be able to discriminate. I&#039;ve got a bunch of electronic test gear gathering dust; I really ought to wind a coil, hook it up to a signal generator and a spectrum analyzer, and see if I can see anything.</p><p><br /></p><p>Sometimes it&#039;s not about being smart, but being well-equipped. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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