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<p>[QUOTE=&quot;desertgem, post: 850194, member: 15199&quot;]Whatever mill means as the term &quot;mill&quot; isn&#039;t a scientific measurement. But once you get a good answer for that, Silver weighs 5.525 oz/cubic inch. SO once the surface area of the bar is determined, and you know what they really mean as to the &quot;mill&quot;, if it is a 1/10 inch, multiply&nbsp; the surface area by .5525 oz. If it is&nbsp; 1/10,000 inch, multiply the surface area by .0005525 oz.</p><p><br /></p><p>A reference on silver plating says .00002” to .002” is the normal range depending on intended use</p><p><br /></p><p>I suspect it is the latter myself.</p><p><br /></p><p>If we knew it was really pure copper under the pure silver, a specific gravity approach would work.[/QUOTE]</p><p><br /></p>

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