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Modern surveys in Europe and the United States show red is also the color most commonly associated with heat, activity, passion, sexuality, anger, love and joy.In China, India and many other Asian countries it is the color of symbolizing happiness and good fortune.The Ancient Egytians and Mayans colored their faces red in ceremonies; Roman generals had their bodies colored red to celebrate victories.It was also an important color in China, where it was used to colour early pottery and later the gates and walls of palaces.Red also became the color of revolution; Soviet Russia adopted a red flag following the Bolshevik Revolution in 1917, later followed by China, Vietnam, and other communist countries.
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).
Today, red and red-orange laser diodes are widely available to the public in the form of extremely inexpensive laser pointers.
Portable, high-powered versions are also available for various applications.
It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan.
Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy.