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<p>[QUOTE=&quot;CaptHenway, post: 4828188, member: 13813&quot;]That may be indicative of a 90% silver coin. May I suggest that you do SG&#039;s on 2 or 3 ordinary silver half dollars just to test how accurate your setup and technique are?</p><p><br /></p><p>Back when I was an AUthenticator for ANACS doing SG&#039;s I figured that anything within 0.1 of the expected SG was close enough. The string may be a problem. I used wire. Also, a tiny drop of Ivory dishwashing soap in the water will help eliminate surface tension where the suspension device enters the water.[/QUOTE]</p><p><br /></p>

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