Red rails dating
On the color wheel long used by painters, and in traditional color theory, red is one of the three primary colors, along with blue and yellow.
Painters in the Renaissance mixed red and blue to make violet: Cennino Cennini, in his 15th-century manual on painting, wrote, "If you want to make a lovely violet colour, take fine lac [red lake], ultramarine blue (the same amount of the one as of the other) with a binder" he noted that it could also be made by mixing blue indigo and red hematite.
Iron oxide also gives the red color to the planet Mars.
In the Renaissance, the brilliant red costumes for the nobility and wealthy were dyed with kermes and cochineal.
The 19th century brought the introduction of the first synthetic red dyes, which replaced the traditional dyes.
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.
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This is the principle that is used to make all of the colors on your computer screen and your television.