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The colour orange occurs between red and yellow in the visible spectrum at a wavelength of about 585–620 nm. It is a pure chroma in the colour theory, with a hue of 30° in HSV colour space. The complementary colour of orange is blue. With pigments such as paints or crayons, the primary colours red (or more accurately, magenta) and yellow mixed together produce the secondary colour orange. Orange pigments are largely in the ochre or cadmium families.
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