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<p>[QUOTE=&quot;desertgem, post: 1445340, member: 15199&quot;]Assuming you don&#039;t wish to saw into it ( which is what many silver buyers who are going to melt it anyway do), it is difficult if the silver layer is fairly thick. Specif gravity measurements can help since 100% copper has a specific gravity of 8.96 and pure silver has a specific gravity of 10.49,&nbsp; any mixture wiull be between these 2 marks.</p><p><br /></p><p>sterling silver ( 92.5%) has a specific gravity of 10.36, and 90% silver ( most US silver coins) has a sp.gr. of 10.31. On the other end, if there was 10% silver plating ( rather high amount) on 100% copper, a rough sp. gr. would be about 9.09. </p><p><br /></p><p>If it was not a plating, but a homogenous mix of silver and copper, you could use acid solutions. </p><p>Specific gravity testing doesn&#039;t harm the coin or bar.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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