John: it isn't clear whether the reaction, he was discribing, was from air or a chemical reaction.
I have recently seen some discolored copper wire that was attached to one of those 5 way binding posts. The wire was "snugged down" fairly tight. It was all discolored. The binding post did not leave a bright copper mark.
Did it make a high resistance connection? I don't know. I didn't measure it. But, the speaker sounded just fine.
I've seen some strange things happen with wires and connections over the years. Dissimilar metals can present quite a problem. But, I digress.
The Rat.
M80s, VP-150, QS8s,
SVS PC 20-39+, OPPO,
Onkyo 703s, Harmony 880
Sony 60" SXRD HDTV
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