violet ≠ purple ≠ orange

LITViolet is spectral: the short end of the visible range, roughly 380–450 nm, a single wavelength. Purple is not in the rainbow. It is a mixture of short (violet or blue) and long (red) light and sits on the straight line of purples on the CIE diagram. Orange (about 590–620 nm) is spectral like violet.

COMPUTEDOn the left is one wavelength from the slider. On the right is a red+violet mixture at the ratio you set. Both are matched to sRGB through the real CIE 1931 2° functions, and the readout classifies each one. The nesting: a spectral orange seed in the middle, the purple mixture as shell, void around.

λ mix red:violet

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