The phrase “every coloration of the rainbow” is not rather as all-encompassing as it appears. For 1 detail, the coloration chips in your hardware store’s paint aisle host some shades you will be difficult-pressed to level to in a true rainbow. But even on a less hair-splitting amount, purple is lacking from that rainbow.
The V in ROYGBIV stands for violet, confident, but that’s not in fact the exact same detail as purple. There is no purple wavelength of light—it needs a mixture of equally crimson and blue wavelengths. That can make it a “nonspectral color”—in reality, it really is the only nonspectral coloration people see. It needs our brains to interpret indicators from equally crimson-delicate and blue-delicate