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.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.The remaining reddened sunlight can also be scattered by cloud droplets and other relatively large particles, which give the sky above the horizon its red glow.and these two types of lasers were widely used in many scientific applications including holography, and in education.In the Renaissance, the brilliant red costumes for the nobility and wealthy were dyed with kermes and cochineal.
Portable, high-powered versions are also available for various applications.
The s RGB number for crimson is 220, 20, 60, which means that the red is slightly less intense and therefore darker, there is some green, which leans it toward orange; and there is a larger amount of blue, which makes it slightly blue-violet.
As a ray of white sunlight travels through the atmosphere to the eye, some of the colors are scattered out of the beam by air molecules and airborne particles due to Rayleigh scattering, changing the final color of the beam that is seen.
The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide.
Iron oxide also gives the red color to the planet Mars.