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<p>[QUOTE="DonnaML, post: 4961094, member: 110350"]Hey, even I managed to do a specific gravity test on a suspected Roman Republican fourree, and I'm a technological incompetent as well as something of a klutz -- you should have seen me trying to tie a piece of thread around the coin so it didn't fall out! I found these instructions easy to follow: <a href="http://coinsblog.ws/2016/06/detecting-counterfeits-specific-gravity.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://coinsblog.ws/2016/06/detecting-counterfeits-specific-gravity.html" rel="nofollow">http://coinsblog.ws/2016/06/detecting-counterfeits-specific-gravity.html</a>. The one piece of equipment you'll need to make proper measurements is a digital scale that measures in 100ths of a gram rather than only 10ths of a gram. And here's a table I found listing the specific gravities of silver, copper, and alloys with various percentages of silver in a silver-copper alloy:</p><p><br /></p><p>100% silver 10.49</p><p>100% copper 8.49</p><p><br /></p><p>98% silver 10.45</p><p>90% silver 10.31</p><p>83.5% silver 10.20</p><p>75% silver 10.05</p><p>50% silver 9.65</p><p>40% silver 9.527</p><p>30% silver 9.37</p><p>20% silver 9.234[/QUOTE]</p><p><br /></p>
[QUOTE="DonnaML, post: 4961094, member: 110350"]Hey, even I managed to do a specific gravity test on a suspected Roman Republican fourree, and I'm a technological incompetent as well as something of a klutz -- you should have seen me trying to tie a piece of thread around the coin so it didn't fall out! I found these instructions easy to follow: [URL]http://coinsblog.ws/2016/06/detecting-counterfeits-specific-gravity.html[/URL]. The one piece of equipment you'll need to make proper measurements is a digital scale that measures in 100ths of a gram rather than only 10ths of a gram. And here's a table I found listing the specific gravities of silver, copper, and alloys with various percentages of silver in a silver-copper alloy: 100% silver 10.49 100% copper 8.49 98% silver 10.45 90% silver 10.31 83.5% silver 10.20 75% silver 10.05 50% silver 9.65 40% silver 9.527 30% silver 9.37 20% silver 9.234[/QUOTE]
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