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IThe shiny (frank) metals from the gold in my mouth indeed were corroding, as could be seen on the bottom of my gold crowns after they were removed. What this corrosion was composed of, I'm really not sure--but it was like a green and white salt, and looked a lot like an old piece of metal that had rusted after years of use (or neglect).

Copper oxidizes/corrodes to a greenish/white color, you can see it quite visibly on copper roofing materials and even pennies if you place one in salt water or vinegar. I have also noticed that if you put vinegar into a bottle with a metal top, probably aluminum base metal, that the metal top will also oxidize and corrode to a greenish white color. Maybe the aluminum, maybe copper coming somewhere I am not sure I simply wash it off now and then.

Good to know about that though, thanks for the info.