The Color Cube

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As it turns, notice the colors of the eight corners:

color hex code is opposite color hex code
white FFFFFF is opposite black 000000
red FF0000 is opposite cyan 00FFFF
green 00FF00 is opposite magenta FF00FF
blue 0000FF is opposite yellow FFFF00

This uses the Red-Green-Blue or RGB values (light)
as opposed to the red, yellow and blue values of pigments.