Today I’m going to try to explain the real reason that barns are painted red: nuclear fusion. And yes, this is an excuse to take a mad ride around some of the stranger corners of physics and chemistry in order to give you the real, this-is-not-BS, answer to a simple question.
How the price of paint is set in the hearts of dying stars
Yonatan Zunger

I hate to rain on your verbal parade, but the reason barns are painted red derives from the tradition of spinning out whitewash with pig’s blood. Barns were painted after the fall slaughter of swine, establishing a tradition that “stuck.” The iron is there, but in hemoglobin.

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