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<p>[QUOTE=&quot;Hobo, post: 1139112, member: 11521&quot;]When you get down to it a SG test is fairly simple. You weigh the coin twice - once dry (normal) and once wet (suspended in water). Then you do a simple calculation (dry weight divided by the difference between the dry weight and wet weight). </p><p>&nbsp;</p><p>JP Martin (grader and authenticator at ANACS and long-time instructor at ANA Summer Seminar) has written simple instructions on how to perform a SG test <a href="http://www.numismedia.com/101/index5.shtml" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.numismedia.com/101/index5.shtml" rel="nofollow">HERE</a>. </p><p>&nbsp;</p><p>Google &quot;specific gravity test&quot; for more detailed instructions and photos of the apparatus to get the wet weight of the coin.[/QUOTE]</p><p><br /></p>

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