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<p>[QUOTE=&quot;Insider, post: 2505421, member: 24314&quot;]Anyone here ever take a specific gravity test on one of the &quot;shipwreck effect&quot; 8 Reales from this treasure?&nbsp; The coins are suppose to be .900 fine silver.&nbsp; I have read that seawater can leach out copper and other trace elements in these coins.&nbsp; I should guess that might make the ratio of silver in the coin to other metals higher; however I don&#039;t think that would change the specific gravity of a .900 fine silver coin.[/QUOTE]</p><p><br /></p>

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