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Moment of Um

Why are the primary colors different from the colors of light?

Moment of Um

American Public Media

Kids & Family, Education For Kids

4.41.5K Ratings

🗓️ 27 November 2023

⏱️ 5 minutes

🧾️ Download transcript

Summary

You may have learned that the colors red, yellow, and blue are called primary colors. It’s sometimes said you can use those three to make all the other colors. But can red, yellow, and blue really mix to make any color, or is there more to the story? We asked color scientist Stephen Westland to help us find the answer.


Got a question that came up out of the blue? Send it to us at BrainsOn.org/contact, and we’ll help find a CYAN-tific answer!

Transcript

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0:00.0

From the brains behind brains on, this is the moment of um.

0:05.0

Answering those questions that make you go, um. Moment of Mm comes to you from a mum.

0:19.0

Mm. Mm.

0:20.0

M. comes to you from APM Studios. I'm Anna G.

0:27.0

Art was always one of my favorite subjects in school.

0:32.9

When I was in second grade, we had an art teacher, Mrs Ames,

0:35.8

that taught us about primary colors

0:37.8

with a little song that I still remember.

0:40.2

It went like this,

0:41.4

Red Yellow Blue, Red Yellow Blue. And went like this, red yellow blue, red yellow blue, I see you, red yellow blue, you are the primary colors,

0:50.5

you make all the other colors, I wish I were a color just like red yellow blue

0:56.5

Yep, that song is still bopping around my brain 30 years down the road

1:01.3

But looking back on the lyrics, I have some questions.

1:05.4

First of all, do I wish I were a color?

1:07.8

Which one?

1:08.8

Green, maybe.

1:09.8

Yeah, yeah, a nice mossy green.

1:13.0

Okay, that answers that one.

1:15.0

But you know what else I learned in school?

1:17.0

I learned that sunlight is made up of all the colors of the rainbow.

1:21.0

If you let sunlight shine through a special glass shape called a prism, it splits the light into those

1:26.0

different colors and you see a little rainbow. So if sunlight is made of all the colors, who decided that red, yellow, and blue were the primary ones?

...

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