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<p>[QUOTE=&quot;medoraman, post: 1038266, member: 26302&quot;]I have seen thousands of corroded silver coins from the ground. It is common and the reason why well preserved silver coins are valuable. True, silver is less corrosive than copper, therefor silver may survive where copper may disappear completely, but silver will corrode. Gold will not, but all other coins do. Ask a metal detectorist in Britain about the condition of silver coins they find that were not protected in a pot or something what they look like when dug up.</p><p><br /></p><p>I am with Doug that silver will go through its natural phases of toning ending up in a glossy black as a color. When the black turns matte, then that is corrosion and starts eating the surface of the coin. I have dipped glossy black coins and matte black coins, usually glossy black ones are ok underneath, but matte black ones almost always are corroded.[/QUOTE]</p><p><br /></p>

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