All the other colors are primary colors and secondary colors. Is there a scientific reason that indigo is notable?
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No, there’s no scientific significance to indigo, although in the context of optics, it’s really indigo that is the primary color, and what Newton called “blue” is cyan/aqua.
Basically, Newton thought there was an aesthetic or metaphysical significance to a set of seven colors spaced out in the spectrum of photons, just like there are seven notes in the do-re-mi… system for Western music in the spectrum of all possible audio frequencies. If you divide the visible spectrum into seven portions, they line up roughly as ROYG(light blue)(dark blue)(purple). Indigo was the name for the most common dye at the time for achieving the deep blue he saw.
If optics were being invented today, maybe that color would have been called “denim” instead!
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