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The red colour of blood comes from protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins.Red pigment made from ochre was one of the first colors used in prehistoric art.The intensity of each component is measured on a scale of zero to 255, which means the complete list includes 16,777,216 distinct colors and shades.The s RGB number of pure red, for example, is 255, 00, 00, which means the red component is at its maximum intensity, and there is no green or blue.Violet is made on a computer screen in a similar way, but with a greater amount of blue light and less red light.So that the maximum number of colors can be accurately reproduced on your computer screen, each color has been given a code number, or s RGB, which tells your computer the intensity of the red, green and blue components of that color.This is the principle that is used to make all of the colors on your computer screen and your television.For example, purple on a computer screen is made by a similar formula to that used by Cennino Cennini in the Renaissance to make violet, but using additive colors and light instead of pigment: it is created by combining red and blue light at equal intensity on a black screen.
At sunrise and sunset, when the path of the sunlight through the atmosphere to the eye is longest, the blue and green components are removed almost completely, leaving the longer wavelength orange and red light.
Red's wavelength has been an important factor in laser technologies; red lasers, used in early compact disc technologies, are being replaced by blue lasers, as red's longer wavelength causes the laser's recordings to take up more space on the disc than would blue-laser recordings.
Red lac, also called red lake, crimson lake or carmine lake, was an important red pigment in Renaissance and Baroque art.
Red helium–neon lasers were used commercially in Laser Disc players.
The use of red laser diodes became widespread with the commercial success of modern DVD players, which use a 660 nm laser diode technology.