All the other colors are primary colors and secondary colors. Is there a scientific reason that indigo is notable?
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The colors of a rainbow are specific wavelengths of light that appear when white light is split by a prism, that we can both see and measure. Indigo had a large enough wavelength to be considered its own color, at higher frequency than Blue and lower frequency than Violet.
Modern teachings of color science accepts a 6-color spectrum because the majority of people don’t *perceive* indigo as distinct enough color between Blue and Violet, so it’s instead taught to be a Tertiary Color. However, people wrongly assume the wavelengths are split evenly, so secondary colors rest in the middle between two primary colors. That’s not true, but it’s taught that way to simplify concepts for the general population.
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