this post was submitted on 26 Aug 2023
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Farmers originally used to seal their barns with a combination of linseed oil (red-ish) and iron oxide (rust, red). Then when paint came around, apparently red paint was the cheapest. https://www.bobvila.com/articles/solved-why-are-barns-painted-red/
Cool! I suspected there had to be a practical reason. Thanks for sharing the link!