Orange (colour) colours on a television or computer screen), orange is generated by combining high intensity red light with a lower intensity green light, with the blue light turned off entirely. Orange is a tertiary colour which is numerically halfway between gamma-compressed red and yellow, as can be seen in the . Regarding painting, blue is the complementary colour to orange. As many painters of the 19th century discovered, blue and orange reinforce each other. The painter Vincent van Gogh wrote to his brother Theo that in his paintings, he was trying to reveal "the oppositions of blue with orange, of red
Judo in Canada starting at first "dan" ("shodan") and ending at tenth "dan" ("judan"). Grades are also differentiated by belt colour. Kano originally adopted white and black belts in 1886 to mark the distinction between "kyū" and "dan" grades, and red and white and solid red belts were later introduced to distinguish judoka who were sixth "dan" and higher (collectively referred to as "kōdansha", or 'ones with high dan'). Coloured belts for "kyū" grades were first introduced by Mikinosuke Kawaishi in France in 1935 because he felt that European students would progress more quickly if they received visible recognition of their achievements. In