Barns Are Painted Red Because of the Physics of Dying Stars
The simple answer is because red paint is cheap. But why is red paint cheap?
"Red ochre—Fe2O3—is a simple compound of iron and oxygen that absorbs yellow, green and blue light and appears red. It’s what makes red paint red. It’s really cheap because it’s really plentiful. And it’s really plentiful because of nuclear fusion in dying stars"
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