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There are three secondary colors. They are the hues green, violet (purple) and orange. Orange from mixing red and yellow, violet (purple) from blue and red, and green from yellow and blue. Tertiary colors: The third set of hues are known as tertiary or intermediate colors. These hues are made by mixing adjacent primary and secondary hues. The six tertiary or intermediate colors are yellow-green, blue-green, blue-violet, red-violet, red-orange, and yellow-orange.
The colors used for adults were too difficult for infants to discriminate, so the researchers chose a set of just three widely separated colors for the infant testing. These comprised two targets (one green and one blue) and a background color that was just on the green side of the boundary between green and blue.