I have my late grandpa's silver spoon attached to my fridge with a neodymium magnet. What kind of chemical reaction causes that discolouration?
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Sulfur causes that effect on silver, and it can happen slowly when exposed to humid air.
You can magically fix it by boiling water (must be boiling) then placing a sheet of aluminium foil in a container, placing the spoon on top of the foil making direct contact, them sprinkling some salt or sodium bicarbonate and pouring the boiling water on top. You'll see it start bubbling, and the bubbles will smell like rotten eggs.
Leave for fifteen minutes, you're done. But again, boiling water, this reaction requires a lot of energy and warm water won't even start it.