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A color wheel based on RGB (red, green, blue) or RGV (red, green,
violet) additive primaries has cyan, magenta, and yellow secondaries
(cyan was previously known as cyan blue). Alternatively, the same
arrangement of colors around a circle can be described as based
on cyan, magenta, and yellow subtractive primaries, with red,
green, and blue (or violet) being secondaries.
Most color wheels are based on three primary
colors, three secondary colors, and the six intermediates formed
by mixing a primary with a secondary, known as tertiary colors,
for a total of 12 main divisions; some add more intermediates,
for 24 named colors. Other color wheels, however, are based on
the four opponent colors, and may have four or eight main colors.
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