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Originally barns were red because, hundreds of years ago, farmers would seal their barns with linseed oil, milk, lime and ferrous oxide, or rust, which killed fungi and mosses. It turned the mixture red.
When paint became more available, many people chose red paint for their barns in honor of tradition.

www.livescience.com/33195-barns-traditionally-painted-red.html

Apr 7, 2011 ... One belief is that barns are red so a farmer's cows can find their way home, but if so, that's a failed strategy cattle are colorblind to the colors red ...

farmersalmanac.com/blog/2008/09/16/why-are-barns-painted-red

Sep 16, 2008 ... Ever wonder why old barns are usually red in color? Red is ... in finding or making a paint that would protect and seal the wood on their barns.

home.howstuffworks.com/question635.htm

Red barns are a common sight in rural parts of the country, but have you ever wondered why they're painted red? Learn about the purpose of red barns.

wonderopolis.org/wonder/why-are-barns-red

Oct 30, 2015 ... Today, many barns are painted red as a form of tradition. A farmer who builds a new barn will often paint it "barn red" to make it look like the red ...

www.smithsonianmag.com/smart-news/barns-are-painted-red-because-of-the-physics-of-dying-stars-58185724

May 10, 2013 ... The simple answer to why barns are painted red is because red paint is cheap. The cheapest paint there is, in fact. But the reason it's so cheap ...

www.grit.com/departments/why-are-barns-red

America's rural scene is enlivened by the presence of bright red barns. Like architectural poppies, they dot the countryside with flashes of scarlet. In spring and ...

www.todayifoundout.com/index.php/2016/02/barns-traditionally-painted-red

Feb 19, 2016 ... Rachel E. asks: Why are barns usually painted red? red-barn ... For farmers and their barns in certain regions, this same mentality applied.

www.good.is/articles/why-are-barns-red

Oct 28, 2016 ... The Wildly Fascinating Reason All Barns Are Painted Red ... But to really dig deep and get to the bottom of why that is, you have to “go all the ...

mentalfloss.com/article/23278/why-are-barns-usually-red

Here's a question from reader Ryan: "Why are barns painted red?" Beginning with the earliest American settlements and continuing into the 18th century, most  ...