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<p>[QUOTE=&quot;rrdenarius, post: 3103912, member: 75525&quot;]I bought a 3/8th Shekel from Brutium, during Punic occupation, in electrum, 216 – 211 BC. I have posted the coin here, and on my blog - (<a href="http://rrdenarius.blogspot.com/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://rrdenarius.blogspot.com/" rel="nofollow">http://rrdenarius.blogspot.com/</a>). This post is to talk about estimating gold content by measuring SpGr. I have seen several articles on line about this technique (<a href="http://www.mdhtalk.org/faqs/sg.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.mdhtalk.org/faqs/sg.htm" rel="nofollow">http://www.mdhtalk.org/faqs/sg.htm</a>). My method is a bit different, but seems to work.</p><p><br /></p><p>The coin looks silver to me, but there is a significant difference in the SpGr (or density) of silver (10.5) and electrum (12.0 for coins in Jenkins &amp; Lewis). My measurements say the coin is probably electrum. The coin.</p><p>[ATTACH]786068[/ATTACH] [ATTACH]786069[/ATTACH] </p><p>My method:</p><p>I made 5 series of weight measurements. </p><ul> <li>Weigh the coin dry. </li> <li>Use Teflon dental floss to tie the coin on a string. </li> <li>Fill a small cup with water</li> <li>Place the cup on a scale and zero the scale. </li> <li>Hold the coin in the cup, under water, without letting it touch the sides. </li> <li>SpGr = Wt of coin in air / Wt of coin in water<br /> </li> <li>To “confirm” my test, I tested one buffalo nickel, two Roman Republican denarii and one silver nugget.</li> </ul><p>The results are:</p><p>SpGr of my coin = 11.0 - 12.1. This corresponds to 10% - 30% gold. The results vary a lot with the small weight in water. I do not know how to post a table here. If you want to see the results, go to my blog. </p><p><br /></p><p>[ATTACH]786071[/ATTACH] [ATTACH]786072[/ATTACH] [ATTACH]786073[/ATTACH] [ATTACH]786074[/ATTACH] </p><p><br /></p><p>Post any electrum coins you have. </p><p>Let me know if you have measured SpGr on any of your coins.[/QUOTE]</p><p><br /></p>

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