Pigments and a green salt from wine

I do find the chemistry and history of pigments to be utterly fascinating.
This compilation provides an interesting summary of preparations, although the liberal number of skulls and crossed bones does make one aware of the beautiful danger of heavy metals.

I found the page while trying to figure out why the wine stopper, with a metallic tip, was accumulating a green salt when left for an extended time over red wine. I would have thought the stopper had stainless steel at the end, so the thought that I’m producing verdigris seems unlikely. Nickel or chrome plate seems plausible, but it’s hard to believe something like Annabergite, a green nickel mineral could be forming so quickly. I suppose i need help from a chemist of everyday things or an alchemist.

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