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
Blue–green distinction in language plant hues, and grey (like the sea); other shades of green would be referred to in Modern Irish as "uaine" or "uaithne", while "liath" is grey proper (like a stone). Scottish Gaelic uses the term "uaine" for "green". However, the dividing line between it and "gorm" is somewhat different than between the English "green" and "blue", with "uaine" signifying a light green or yellow-green, and "gorm" extending from dark blue (what in English might be navy blue) to include the dark green or blue-green of vegetation. Grass, for instance, is "gorm", rather than "uaine". In addition, "liath" covers a range