Red is derived of brown, so brown does have connection to the R in prism. How?

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How much of Math is logical enough to be learnt?

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Sun gives light .Does it give heat to earth?

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Why couldn't we get obsessed with the invention called electricity?

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Why aren't dolphins colorful?

Nature

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Alternative to mediation analysis?

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Karl Pfeifer

Actually it's the other way around. Brown is derived from red, in combination with (i.e. mixed with) other colors: See Kapil Chadha's explanation: https://www.quora.com/Which-colors-combine-to-make-brown 🎨

Regarding brown's relation to the visible spectrum, go to https://en.wikipedia.org/wiki/Brown and scroll down to the section on optics.

Polina Lemenkova

Brown is a a mix of green and red. Adding some purple makes it a reddish brown (that's about painting palette colors).