How many colors are in the 12 color RYB wheel?

There are 24 colors in the 24 color RYB wheel (red, scarlet, vermilion, persimmon, orange, orange peel, amber, gold, yellow, lime, chartreuse, harlequin green, green, viridian, teal, cobalt, blue, indigo, violet, amethyst, purple, aubergine, magenta, and crimson).