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Conservation and Corrosion

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We can often conserve corroded coins. Most often we can remove surface debris and residues--remove the green--and take measures to prevent the corrosion from becoming worse. Unfortunately, the corrosion is deep into the surface of the metal. Conservation can not reverse the deep altering of the surface such corrosion typically leaves so a coin that is corroded before conservation, will still be corroded after conservation and will not grade with NGC. I have seen coins and tokens come in to NCS with what can be mistaken as corrosion but is actually a surface contaminant that does conserve well and does grade with NGC. These are the exception and not the rule.


Chris, NCS

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