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Today modern darkrooms usually use an amber safelight.
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.
Since red is the colour of blood, it has historically been associated with sacrifice, danger and courage.
Modern surveys in Europe and the United States show red is also the colour most commonly associated with heat, activity, passion, sexuality, anger, love and joy.
Primates can distinguish the full range of the colors of the spectrum visible to humans, but many kinds of mammals, such as dogs and cattle, have dichromacy, which means they can see blues and yellows, but cannot distinguish red and green (both are seen as gray).
Bulls, for instance, cannot see the red color of the cape of a bullfighter, but they are agitated by its movement.
It was also an important colour in China, where it was used to colour early pottery and later the gates and walls of palaces.
In the Renaissance, the brilliant red costumes for the nobility and wealthy were dyed with kermes and cochineal.
Violet is made on a computer screen in a similar way, but with a greater amount of blue light and less red light.The 19th century brought the introduction of the first synthetic red dyes, which replaced the traditional dyes.Red also became the colour of revolution; Soviet Russia adopted a red flag following the Bolshevik Revolution in 1917, later followed by China, Vietnam, and other communist countries.Iron oxide also gives the red color to the planet Mars.The red colour of blood comes from protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins.