Why can't the majority of people distinguish between indigo and

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What tertiary color is the most closely representative of indigo? - Quora

What is the difference between blue and violet? - Quora

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What's the difference between blue and indigo? - Quora

Why are indigo and violet colors of the rainbow but not purple

Does indigo need a violet tinge, or can it be a completely blueish color? - Quora

Is the color Victorian blue really a shade of indigo? - Quora

Why are indigo and violet colors of the rainbow but not purple? - Quora

Why is violet above blue in the visible spectrum? Violet is a mixture of blue and red. Red has a longer wavelength than blue. Shouldn't ultra violet be called ultra blue?

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