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There is some good info here:
Also when I teach it we use the double primary sysstem so that
the wheel goes: yellow(red shade), yellow(blue shade), Green, Blue
(green shade), blue (red shade), Purple, Red(blue shade),
The true primaries are of course magenta, cyan, yellow... approximating
to Red(Blue shade) eg a cerise or crimson, Blue(Green shade) eg a
phthalo or prussian blue, yellow(blueshade) eg a lemon yellow.
Too often pupils are provided with scarlet [red(yellowshade)],
Ultramarine Blue [Blue(red shade)], a cadmium yellow[Yellow(Red shade)]
and wonder why they cant mix bright purples, and clean greens.
Too complicated? :-)
-- James Nairne