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<p>[QUOTE=&quot;calcol, post: 26240898, member: 77639&quot;]The SS Central America sank off the coast of South Carolina in 1857.&nbsp; It carried a huge amount of California gold, much of it in the form of double eagles struck in San Francisco.&nbsp; Because there were hundreds of tons of iron in and on the ship, a layer of rust of a type know as goethite was deposited on nearly all the gold over many decades.&nbsp; And was present when the coins were salvaged.</p><p><br /></p><p>Bob Evans, chief restorer of the Central America gold, developed a technique for removing the rust without damaging the gold underneath.&nbsp; It was a very gentle, successful technique.&nbsp;&nbsp; Many of the coins were graded MS.</p><p><br /></p><p>Sometimes the goethite would come off in large flakes, and the flakes would be a mirror image of the coin underneath.&nbsp; Bob preserved some of the largest flakes.&nbsp; One of the most spectacular is pictured below (photo by David Heinrich).&nbsp; It’s a cast of an 1857-S double eagle.</p><p>To read more, see <a href="https://www.coinbooks.org/v28/esylum_v28n24.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinbooks.org/v28/esylum_v28n24.html" rel="nofollow">https://www.coinbooks.org/v28/esylum_v28n24.html</a> .</p><p><br /></p><p>Cal</p><p>[ATTACH=full]1676143[/ATTACH][/QUOTE]</p><p><br /></p>

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