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<p>[QUOTE="-jeffB, post: 8099718, member: 27832"]I'm not 100% on board with Sigma for gold testing. However, it's more useful than a magnet -- any magnetic fake would have to weigh <i>way</i> less than a standard coin, or be <i>way</i> thicker, because steel has less than half the density of gold.</p><p><br /></p><p>Check dimensions, check weight, and carefully check the coin's appearance. I think the only gold <i>substitute</i> that would pass dimensions-vs-weight is tungsten, and while we've seen "gold" fakes with a tungsten core, I don't think they're very common yet. <i>Those</i> should still turn up on a Metalytics test.</p><p><br /></p><p>As for "how temperamental is the Sigma", I can't answer, as I don't have one. I was really skeptical about their technology as a whole, until I read their user's manual, which is quite specific about what you can and can't expect from the machine. It's not perfect, but it's useful, and I think it's under $1K for a new machine, vs. over $10K for a new XRF machine.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 8099718, member: 27832"]I'm not 100% on board with Sigma for gold testing. However, it's more useful than a magnet -- any magnetic fake would have to weigh [I]way[/I] less than a standard coin, or be [I]way[/I] thicker, because steel has less than half the density of gold. Check dimensions, check weight, and carefully check the coin's appearance. I think the only gold [I]substitute[/I] that would pass dimensions-vs-weight is tungsten, and while we've seen "gold" fakes with a tungsten core, I don't think they're very common yet. [I]Those[/I] should still turn up on a Metalytics test. As for "how temperamental is the Sigma", I can't answer, as I don't have one. I was really skeptical about their technology as a whole, until I read their user's manual, which is quite specific about what you can and can't expect from the machine. It's not perfect, but it's useful, and I think it's under $1K for a new machine, vs. over $10K for a new XRF machine.[/QUOTE]
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