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<p>[QUOTE=&quot;kevin McGonigal, post: 5074439, member: 72790&quot;]I will probably mangle Kevin Butcher&#039;s work trying to do that but I believe it has to do with a natural process whereby copper is leached out of the silver on the surface by naturally occurring atmospheric conditions and chemical changes from contact with chemicals from handling, the other from some kind of technique the mint workers knew of that allowed for a greater purity of silver on the exterior. Butcher did not say this but I have wondered if it might be similar to what the US mint employed with the Kennedy half dollars and some of the Eisenhower dollars of the late 1960&#039;s which were 80% silver on the exterior and a much debased silver below that for a total of 40% silver as opposed to the earlier 90%. Perhaps someone else here more versed in the metallurgy of either (or both kinds ) of coins could chime in on this.[/QUOTE]</p><p><br /></p>

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