Basically what the title asks.
All the other colors of the rainbow are either primary or secondary. Violet is a shade of purple and (as I’ve always understood it) indigo is somewhere between navy and purple.
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purple is red and blue light combined, rainbows go from red through green to blue, there’s no way for red and blue light to combine in a simple rainbow. Indigo and violet either mean dark blue or they are there because there is a double rainbow. It would make more sense to go red yellow green cyan blue. Even red, yellow, green, blue and violet as it was before Newton makes more sense, he added orange and indigo to make it 7 colours to match do re mi fa so la ti in music
It would mess up the cross-stitch I use. Richard Of York Gave Battle Poorly. Actually that’s not bad.
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