Why are red, yellow and blue primary colors?

Red, yellow and blue are primary colors. But they’re not 

 primary colors. Exactly what makes colors primary, and what other primary colors exist? Stephen Westland, a professor of color science and technology at the University of Leeds, helped us find the answer.

Red, yellow and blue are primary colors. But they’re not the only primary colors. Exactly what makes colors primary, and what other primary colors exist? Stephen Westland, a professor of color science and technology at the University of Leeds, helped us find the answer.
Got a colorful question? Send it to us at BrainsOn.org/contact, and we’ll help paint a pretty answer. 

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Smash Boom Best is a debate show for kids and families from the makers of the award-winning podcast, Brains On! Every episode takes two cool things, smashes them together and lets you decide which is best.


Smash Boom Best

A history show for the whole family! Every episode explores the origin of just one thing — like sandwiches, video games, clocks and more — while teaching listeners to think critically about history.


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Our mission is to encourage kids’ and curious adults’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.


Why are red, yellow and blue primary colors?

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