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<p>[QUOTE=&quot;Boss, post: 519827, member: 15110&quot;]Again, I would state Spock that oil does not chemically alter the surface at all. It preserves it and protects from outside reactive air contaminates: sulfur, chlorine, pollution, etc. For an altered surface there has to be a chemical reaction in which ions, elements are removed, or new unstable products or formed. Verdigris is not a beneficial by product of a chemical interaction of metal and contaminant (sulfur I assume), though it does fill in nasty holes in coins often. Carbon polymers of oil are not reactive with copper, unless under extreme heat which will degrade the oil- I have researched this point, though I am admittedly not a chemist.&nbsp; If Jim or Thad want to jump in[/QUOTE]</p><p><br /></p>

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