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<p>[QUOTE=&quot;quick dog, post: 124761, member: 4093&quot;]<font size="3">How can you be so sure that the metallic oxidation products on the surface of this old coin are from PVC corrosion?&nbsp; I would not worry about it.&nbsp; That coin is undoubtedly made from a crude alloy that contains silver, but what else?&nbsp;&nbsp; Right now, you don&#039;t know.&nbsp; Nobody knows.&nbsp; I&#039;ll bet it has traces of several metals; Ag, Cu, Zn, Pb. etc.</font>[/QUOTE]</p><p><br /></p>

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