Red rails dating
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.Colors with a shorter wavelength, such as blue and green, scatter more strongly, and are removed from the light that finally reaches the eye.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.In modern color theory, also known as the RGB color model, red, green and blue are additive primary colors.Red, green and blue light combined together makes white light, and these three colors, combined in different mixtures, can produce nearly any other color.This is the principle that is used to make all of the colors on your computer screen and your television.
Since red is the color of blood, it has historically been associated with sacrifice, danger and courage.
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.
Since it was translucent, thin layers of red lac were built up or glazed over a more opaque dark color to create a particularly deep and vivid color.
Unlike vermilion or red ochre, made from minerals, red lake pigments are made by mixing organic dyes, made from insects or plants, with white chalk or alum.
The Ancient Egyptians and Mayans colored their faces red in ceremonies; Roman generals had their bodies colored red to celebrate victories.