Why are indigo and violet in the rainbow and not just purple?

mookulator@wirebase.org to No Stupid Questions@lemmy.world – 143 points –

I always learned “ROYGBIV” as the colors of the rainbow. Red, orange, yellow, blue, indigo, violet.

What’s up with the last two? Isn’t indigo basically just dark blue? Why is it violet and not purple? Can’t it just be “ROYGBP”?

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