did-you-kno: Barns are red because of mold. 18th- century American farmers prevented mold growth by covering their barns with a mixture of milk, lime, iron, and rust, which turned the wood red. Once mass-produced paint became available, red was

did-you-kno: Barns are red because of mold. 18th- century American farmers prevented mold growth by covering their barns with a mixture of milk, lime, iron, and rust, which turned the wood red. Once mass-produced paint became available, red was

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