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Red is the color at the long wavelength end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. It is a primary color in the RGB color model and a secondary color (made from magenta and yellow) in the CMYK color model, and is the complementary color of cyan.
Red is the color most commonly associated with love, followed at a great distance by pink. It the symbolic color of the heart and the red rose, is closely associated with romantic love or courtly love and Saint Valentine's Day. Both the Greeks and the Hebrews considered red a symbol of love as well as sacrifice.
Red is a primary color across all models of color space. It is the color of blood . It is often associated with love , passion , and lust but also danger and aggression.
The color is defined as red in the NCS or Natural Color System (NCS 1080-R). The Natural Color System is a color system based on the four unique hues or psychological primary colors red, yellow, green, and blue. The NCS is based on the opponent process theory of vision.
ISCC–NBS descriptor. Vivid reddish orange. B: Normalized to [0–255] (byte) Scarlet is a bright red color, [1] [2] sometimes with a slightly orange tinge. [3] In the spectrum of visible light, and on the traditional color wheel, it is one-quarter of the way between red and orange, slightly less orange than vermilion.
Specific color meaning. Different colors are perceived to mean different things. For example, tones of red lead to feelings of arousal while blue tones are often associated with feelings of relaxation. Both of these emotions are pleasant, so therefore, the colors themselves can procure positive feelings in advertisements.
In the 20th century, red was the color of Revolution; it was the color of the Bolshevik Revolution in 1917 and of the Chinese Revolution of 1949, and later of the Cultural Revolution. Red was the color of communist parties from Eastern Europe to Cuba to Vietnam.
In the 1969 study Basic Color Terms: Their Universality and Evolution, Brent Berlin and Paul Kay describe a pattern in naming "basic" colors (like "red" but not "red-orange" or "dark red" or "blood red", which are "shades" of red). All languages that have two "basic" color names distinguish dark/cool colors from bright/warm colors.
As an example the colour red symbolises left-wing ideologies in many countries (leading to such terms as "Red Army" and "Red Scare"), while the colour blue is often used for conservatism, the colour yellow is most commonly associated with liberalism and right-libertarianism, and Green politics is named after the ideology's political colour.
Crimson is a rich, deep red color, inclining to purple. It originally meant the color of the kermes dye produced from a scale insect, Kermes vermilio, but the name is now sometimes also used as a generic term for slightly bluish-red colors that are between red and rose. It is the national color of Nepal.