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<p>[QUOTE=&quot;Insider, post: 2557720, member: 24314&quot;]Specific gravity is the only non-destructive test I know of as all the others (without shaving or drilling damage) only read to a thin depth of the surface. Trouble w/SG testing is ancients often have fissures that trap air and screw up the readings.&nbsp; I suppose using a vacuum chamber of some kind or forcing the water into the coin by soaking it under pressure would make the test more accurate.&nbsp; Wonder what that &quot;rig&quot; would cost. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /></p><p><br /></p><p>A month ago I tried to take specific gravity readings from a group of sea salvage 8 Reales with no luck.&nbsp; I could see bubbles forming on the coins surface shortly after submersion.&nbsp; The SG readings varied by .7 which was of no use to me at all.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie46" alt=":facepalm:" unselectable="on" unselectable="on" /> <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie52" alt=":hilarious:" unselectable="on" unselectable="on" />&nbsp; I assure you it was not funny at the time.[/QUOTE]</p><p><br /></p>

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