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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 ... The image of a quaint red barn against green grass is as American as apple pie, but where does the tradition come from? Although there are ...

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 (or, perhaps, was) a popular color for barns due not to its color shade but for its ...

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.

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 ...

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

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 barns of the past.

www.businessinsider.com/why-barns-red-2017-2

Feb 24, 2017 ... Here is a historic reason behind why barns are mostly always painted red.

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.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 ...

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

Nov 16, 2009 ... Here's a question from reader Ryan: "Why are barns painted red?" Beginning with the earliest American settlements and continuing into the ...