Yellow is the color of light whose wavelength is between 565nm and 590nm, or is a mixture of red and green light that appears to be the same color.
Yellow is one of the subtractive primary colours, and its complementary color is blue. However, because of the characteristics of paint pigments used in the past, painters traditionally regard its complement as purple.
spectral reflectance curve
Usage, symbolism, colloquial expressions
Yellow is a bright cheerful color, but in the English language, yellow is associated with jaundice and cowardice. In American slang, a coward is said to have a "yellow belly." It can also mean that something is tainted, as in the expression "yellow journalism."
Yellow was the symbol for the Emperor of China and of the Chinese monarchy. It was also the color of the New Party in the Republic of China.
Yellow also symbolises royalty in many other cultures, like much of South East Asia. Like China, commoners are not allowed to wear yellow until modern times.
In the United States in the 20th century, immigrants from China and other East Asian nations were derogatively referred to as a "Yellow peril," which probably referred to skin color.
Yellow, in international political organizations, is the color for liberalists.
In some countries, taxicabs are commonly yellow. This practice apparently began in New York City, where taxi owner Harry N. Allen painted his taxis yellow after learning that yellow is the color most easily seen at a distance.
In Canada and the United States, school buses are almost uniformly painted a yellow color (often referred to as "school bus yellow") for purposes of visibility and safety, and Britishbus operators such as FirstGroup are attempting to introduce the concept there. "Caterpillar yellow" and "high-visibility yellow" are used for highway construction equipment.
In auto racing, a yellow flag signals caution. Cars are not allowed to pass one another under a yellow flag.
The Yellow Pages is the section of a phone book or online phone directory that lists business numbers by category. They are named for the color paper they are printed on in phone books to distinguish them from the regular listings.
Yellow is any color of light that stimulates both the red and green cone cells of the retina, but not the blue cone cells.
The yellow birch (Betula alleghaniensis) is a birch species native to eastern North America, from Nova Scotia, New Brunswick, and southern Quebec west to Minnesota, and south in the Appalachian Mountains to northern Georgia.
Yellow is the color of the snookerball that has a 2-point value.
Color blind hunters are better at picking out prey against a confusing background, and the military have found that color blind soldiers can sometimes see through camouflage that fools everyone else.
Genetic red-green color blindness affects men much more often than women, because the genes for the red and greencolor receptors are located on the X chromosome, of which men have only one and women have two.
Color codes present particular problems for color blind people as they are often difficult or impossible for color blind people to understand.
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