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<p>[QUOTE=&quot;desertgem, post: 2006558, member: 15199&quot;]The 88% copper/12% zinc mix should have a sp.gr. close to 8.715 and the 65% copper/35% zinc mix should be about 8.301, and should be determinable, if the mint tolerances were the same and relatively a small% , and the scale had good resolution. </p><p><br /></p><p>If the size of the coins ( volume by water displacement) was the same, the difference should show by accurate weighing (no sp gr. test needed), unless a very small coin and the mint tolerances statistically made it undetermined.</p><p><br /></p><p>Because of a different sp. gr. , the 2 varieties could not be both the same design, volume and weight. If same volume/design, I would just determine by weighing accurately. If different volume/design, I would use the sp.gr. method.[/QUOTE]</p><p><br /></p>

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