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<p>[QUOTE=&quot;daveydempsey, post: 9862303, member: 22&quot;]You should have had a word with the Ancient Coin guys.</p><p><br /></p><p>It sounds like Bronze Disease to me.</p><p><br /></p><p>Bronze disease is an irreversible and nearly inexorable corrosion process that occurs when chlorides come into contact with bronze or other copper-bearing alloys. It can occur as both a dark green coating, or as a much lighter whitish fuzzy or furry green coating.</p><p><br /></p><p>Here is a treatment for Bronze Disease on coins.</p><p><br /></p><p><b>Dissolve benzotriazole in ethanol (6-7% solution) and soak the coin from 1 hour to 2 days.</b> <b>Following this step, move the coin back into distilled water for 1 week to rest it</b>.[/QUOTE]</p><p><br /></p>

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