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<p>[QUOTE=&quot;desertgem, post: 1867016, member: 15199&quot;]But is there anything between it and a XRF analysis ( which is limited to surface) that is nondestructive ( certainly acid or chemical tests on the medal are not)? Yes there is a correction as the definition assumes water at 4 degrees C, but this is almost exactly the 40 degrees F.&nbsp; that water in a refrigerator would be.&nbsp; It is better than the drop-ping test, chemicals , or &#039;slide&#039; test, IMO. A 30 second under water would not be dangerous to the medal unless it was water soluble.</p><p><br /></p><p>I do specific gravity for minerals, and the longest part ( once set up) is to do the math on a calculator. But just my opinion.[/QUOTE]</p><p><br /></p>

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