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<p>[QUOTE=&quot;quick dog, post: 153475, member: 4093&quot;]What happened chemically to that coin?&nbsp; What chemcials might someone use to &quot;clean&quot; corroded coins?&nbsp; What do you think caused the distinctive color change?&nbsp; I wonder if the coin had some residual chemical on it?&nbsp; I would have assumed that metal being just metal, that some residual corrosive chemical must have caused the color change.&nbsp; Do these dipping compounds selectively remove one or more base metals, and leave silver near the surface?&nbsp; Does a dipped coin become porous on the surface?</p><p><br /></p><p>What would bank-vault moisture do to a coin in the absence of some corrosive or oxidizing gas or salt?&nbsp; Clearly, your average 500-year-old coin did not lay around in an air-conditioned bank vault.</p><p><br /></p><p>Interesting.[/QUOTE]</p><p><br /></p>

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