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<p>[QUOTE=&quot;johnmilton, post: 8039110, member: 101855&quot;]Gold coins can fair fairly well on the ocean floor if they are in the middle of a pile of coins and are protected from the ocean currents. Coins that are not protected lose their luster, from being bombarded with tiny particles, but retain a lot of sharpness. It’s called the “sea water effect,” and it does lower value by a fairly strong margin. </p><p><br /></p><p>The high priced coins that have been recover from the <i>SS Central America</i> were the pieces in the center of the pile. The $20 gold pieces were packed in wooden boxes. The boxes disintegrated leaving the piles of coins intact on the ocean floor. </p><p><br /></p><p>The savage company sucked them up very carefully making sure that coins did not come in contact with each other. Then they were “curated” in chemicals to remove whatever may have accumulated on them over the 140 years. After a lengthy court battles, they were graded, mostly by PCGS, and marketed to the public. </p><p><br /></p><p>The one preservation issue with these pieces is copper staining. I have seen some of these coins get brown spots over a five to ten year period. There is nothing you can do about it, and sometimes it can be severe.[/QUOTE]</p><p><br /></p>

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