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<p>[QUOTE="-jeffB, post: 2886336, member: 27832"]Specific gravity tests are really delicate, especially on an item as small as a coin.</p><p><br /></p><p>The US government made 90% silver coins for over a hundred years, with the composition regularly tested. Refiners, whose livelihood depends on actual silver content, routinely process these 90% silver coins. Anyone with access to an XRF scanner can non-destructively check as many 90% coins as they like; anyone with access to a silver testing kit can do destructive tests.</p><p><br /></p><p>Anyone in any of these positions would raise the rafters if they found lots of "90%" coins deficient in silver.</p><p><br /></p><p>On the other side of the dispute, we have an amateur with a string, a cup, and a scale.</p><p><br /></p><p>I have great respect for amateur scientists and investigators, and I want to do everything I can to encourage them. But if your test setup frequently indicates that US coins have the wrong composition, there's most likely a problem with your test setup, not the coins.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 2886336, member: 27832"]Specific gravity tests are really delicate, especially on an item as small as a coin. The US government made 90% silver coins for over a hundred years, with the composition regularly tested. Refiners, whose livelihood depends on actual silver content, routinely process these 90% silver coins. Anyone with access to an XRF scanner can non-destructively check as many 90% coins as they like; anyone with access to a silver testing kit can do destructive tests. Anyone in any of these positions would raise the rafters if they found lots of "90%" coins deficient in silver. On the other side of the dispute, we have an amateur with a string, a cup, and a scale. I have great respect for amateur scientists and investigators, and I want to do everything I can to encourage them. But if your test setup frequently indicates that US coins have the wrong composition, there's most likely a problem with your test setup, not the coins.[/QUOTE]
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silver content of US coins
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