
Complementary colors are pairs of colors which, when combined in the right proportions, produce white or black. When placed next to each other, they create the strongest contrast and reinforce each other. They are widely used in art and design. The pairs of complementary colors vary depending upon the color model, and how the color is made. In pai...
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http://en.wikipedia.org/wiki/Complementary_colors

Two hues directly opposite one another on a color wheel which, when mixed together in proper proportions, produce a neutral gray. The true complement of a color can be seen in its afterimage.
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http://www.encyclo.co.uk/local/21532

Colors that are directly opposite each other on the color wheel, such as red and green, blue and orange, and violet and yellow. When complements are mixed together they form the neutral colors of brown or gray.
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http://www.latinart.com/glossary.cfm?sort=C

Type: Term Definitions: 1. pairs of different colors of light that produce white light when combined.
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http://www.medilexicon.com/medicaldictionary.php?t=19057

Colors at opposite points on the color wheel, for example, red and green, yellow and purple.
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http://www.watercolorpainting.com/glossary.htm

pairs of colors that are opposite one another on the color wheel. Red and green, blue and orange, and yellow and violet have the greatest degree of contrast. These pairs are also complementary colors
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https://education.ket.org/resources/visual-arts-glossary/

color that when used together enhance each other
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https://sciencetrek.org/sciencetrek/topics/light_and_color/glossary.cfm

Colors located opposite one another on an artist
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https://www.encyclo.co.uk/local/22488

Colors opposite each other on the color circle; when additively mixed, they create the sensation of white light.
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https://www.encyclo.co.uk/local/22842
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