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Turquoise stuff on keycaps
(lemmy.nz)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
As people have said it's likely corrosion. More specifically, verdigris. It's the same sort of corrosion you see on the nosebridge of glasses. It's caused by the oils on your skin reacting with the bare metal of the keycaps. There isn't really a solution to stop it, apart from putting a clear coat over the metal.
Came here to say verdigris. Not disappointed that someone beat me to it.
It's just a lovely word.