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Not Exactly...

...as silver oxidation and tarnish aren't necessarily the same thing. Silver oxide is a good conductor but silver tarnish caused by sulfur or chlorine compounds is a crap conductor.
Pure silver doesn't oxidize readily but when it does, the oxidized layer usually has a light grey appearance.
Silver does "tarnish" as a result of contact with sulfur and chlorine compounds which produce the typical dark grey to black seen on silverware, jewelry and inside old silver contact type switches. It's one reason you don't put silverware in the dishwasher unless you like polishing it. These compounds are also present in homes as a result of oil or gas furnaces, gas water heaters, fireplaces and swimming pools or hot tubs. In the case of the former it's usually hydrogen sulfide and in the latter it's chlorine compounds. You can often see the yellow sulfur deposits around chimneys and vents and you can usually smell a swimming pool from a distance.
Even your tap water may have one or the other if you have chlorinated city water or well water with high sulfur content.
Cigarette/cigar smoke does it as well, but who smokes in 2017? :-)



Edits: 01/12/17

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