[eishtmo]

Magenta is a nonspectral color, meaning it doesn't appear in rainbows or prisms refracting white light (all wavelengths). All pinks and purples are also nonspectral.

Only the fully saturated rainbow colors ROYGBIV are spectral colors. Indigo is deep blue. Violet, borderline between visible and UV light, is a single wavelength, but it excites the tail of our eye's Red cones, so appears bluish-purple.

The CIE Chromaticity Diagram https://en.wikipedia.org/wiki/Chromaticity shows it best, where the spectral colors form the curved outside, and the nonspectral colors are the straight 'line of purple' and all interior colors.

It is surprising that green's (~495-565 nm) complementary colors are all on the nonspectral line of purples (draw line from purple's corner endpoint, through the white point, to corresponding green).