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color circle 
Representation of the color spectrum on a circle.
yellow-green 
green 
blue-green 
blue 
violet-blue 
violet 
red-violet 
red 
orange-red 
orange 
orange-yellow 
yellow 
primary colors 
Colors that cannot be obtained by mixing other colors.
secondary colors 
Colors obtained by mixing equal proportions of two primary colors.
tertiary colors 
Colors obtained by mixing equal proportions of a primary color and a secondary color.