The extraspectral hues require mixing light of at least two different wavelengths (red and blue in different proportions), while the other hues can all be made

The extraspectral hues require mixing light of at least two different wavelengths (red and blue in different proportions), while the other hues can all be made from a single wavelength of light. I understand that lithium chloride can burn with a magenta flame, but that just means that its combustion reaction produces light with that particular distribution of wavelengths in its spectrum - similar to a white flame which would have red, green, and blue. Pigments work differently than light emitting sources, as they absorb light that is not present in the reflected color. So a magenta pigment is not all that special, it just means it absorbs green. Quinacridone and crystal violet (hexamethyl pararosaniline chloride) are two such examples, each capable of a brilliant magenta or purple color from a single molecule.