Actually, there are many mistakes in what we generally think the colours are. Issac Newton called what we know call cyan, blue, and what we call blue, as violet, as in 'roses are red, violets are... blue.' And, while Indigo IS in a rainbow, it is really a shade of blue, and was only added so there was 7 colours as there is 7 musical notes. Also to make note, if there appears to be violet in a rainbow you see, that's because you're viewing an account where one of the generally unviewable inner circle's red's has overlapped with the outer ring's blue. And finally, these are the BASE colours- technically there's thousands in the rainbow.
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