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Interesting fact of the day. All aluminum has a skin of sapphire. When you cut a piece of aluminum, and expose the pure aluminum to the air it very quickly reacts with the air on the surface forming aluminum oxide, which is identical to lab and natural sapphire, except much more pure.
@freemo There is a Deutsche word to describe what I was doing. Trying to be funny but miserably failing.
@AmpBenzScientist Why is that? Not sure I follow (though i suspect its a joke, but I still dont follow).