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<p>[QUOTE=&quot;lordmarcovan, post: 25522110, member: 10461&quot;]True, some sea-salvaged gold does get encrusted as a result of the seawater interacting with the base metals the coins were alloyed with.</p><p><br /></p><p>One of the dealers who handled the <i>RMS Douro</i> sovereigns did <a href="https://www.allgoldcoins.co.uk/pages/31-the-sovereigns-of-the-rms-douro?srsltid=AfmBOopd0oY5oHvMupPRA9GItRioLJvyCZkQAm2UH46kqw_iVRrTuD_A" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.allgoldcoins.co.uk/pages/31-the-sovereigns-of-the-rms-douro?srsltid=AfmBOopd0oY5oHvMupPRA9GItRioLJvyCZkQAm2UH46kqw_iVRrTuD_A" rel="nofollow">mention</a> that a number of them had “rust spots”.&nbsp; Not technically accurate (since neither gold nor the copper in the alloy will <i>rust</i>, both being nonferrous metals), but it seems those probably did suffer some deposits:</p><p><br /></p><p><br /></p><p>Apparently most of the Australian coins like mine were nice, though, and in higher grade.[/QUOTE]</p><p><br /></p>

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