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<p>[QUOTE=&quot;Insider, post: 2349779, member: 24314&quot;]That is a proprietary secret at NCS.&nbsp; I&#039;ve tried to find out many times <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" /> Unless you can get one of them to talk and risk loosing their job - who knows.&nbsp; PCGS has said a little about what they did to the salvage coins but I&#039;ve forgotten what I read and where.&nbsp; Look up sea water conservation of coins and in many cases electrolytic baths are mentioned.&nbsp; Anyway, the encrustations on gold are easy to remove.&nbsp; Remember, gold is impervious to most acids while the crust is not.&nbsp; Salvaged silver is a much different story.&nbsp; Most of that stuff is corroded so the term &quot;sea water surface&quot; or something similar is put on the label.[/QUOTE]</p><p><br /></p>

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