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<p>[QUOTE=&quot;frech001, post: 2628625, member: 20616&quot;]I purchased a large old collection of coins that had been improperly stored for 40 years in a basement and a barn.&nbsp; Some had been coated with shellac or varnish that was cracked allowing verdigris to form on the exposed surfaces. This coin looks like some of the worthless coins I experimented on. I first removed the shellac or varnish with acetone then treated the verdigris with zinc chloride (commercial solder flux) liquid which attacked the copper oxides (verdigris) and left hollow places on the surface of the coin that had deep verdigris penetration. Zinc chloride does not attack the copper like an acid would, but leaves the coin with an unnatural shiny surface. Your coin looks similar though appears to have been chemically re-toned with sulfur and then wiped off to appear to have been naturally worn.[/QUOTE]</p><p><br /></p>

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