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<p>[QUOTE=&quot;-jeffB, post: 3913549, member: 27832&quot;]Just as a quick aside, I think Jim mistyped &quot;titanium&quot; where he meant &quot;tungsten&quot;, and I&#039;d like to nip this in the bud before it spreads.</p><p><br /></p><p><b>Tungsten</b>&#039;s density is 19.25 g/cc, compared to gold&#039;s 19.3 g/cc; that makes it useful (dangerous) as a substitute for gold. You&#039;d need excellent equipment and lab technique to distinguish gold-covered tungsten from pure gold based on specific gravity alone. Coin gold (90+% gold, balance copper) is probably less dense, so you might be able to get an<i> exact</i> match on density for a tungsten-stuffed gold coin.</p><p><br /></p><p>Titanium&#039;s density is under 5 g/cc, less than gold, silver, copper, even iron. It&#039;s <i>not</i> useful in counterfeiting.[/QUOTE]</p><p><br /></p>

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