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When used for flowers, red often refers to purplish (red deadnettle, red clover, red helleborine) or pink (red campion, red valerian) colors. Interestingly red appears to be rarely used in names of animals which are a brighter blood-red or scarlet color (Carmine Bee-eater, Scarlet Tanager). The usage for animal color appears similar to that for red ochre, red hair and Red Indian. In this sense it is used to describe coat colors of reddish-brown cattle and dogs, and in the names of various animal species or breeds such as red fox, red squirrel, red deer, Robin Redbreast, Red Grouse, Red Knot, Redstart, Redwing, Red Setter, Red Devon cattle etc. When used about animal coloration red usually refers to a brownish, reddish-brown or ginger color. Red light is the first to be absorbed by sea water, so that many fish and marine invertebrates that appear bright red are black in their native habitat. Oxygenated blood is red due to the presence of oxygenated hemoglobin. Astronomers believe the spot to be some kind of storm. Jupiter's surface displays a Great Red Spot, a football-shaped area south of the planet's equator. Astronomical objects which are moving away from the observer exhibit a red shift. Mars is called the Red Planet because of the reddish color imparted to its surface by the abundant iron oxide present there. In astronomy, stars of stellar class M (the stars with the coolest temperature) are classified as red stars. Though many more modern darkrooms use an amber safelight, red illumination is closely associated with the darkroom in the public mind. Red illumination was (and sometimes still is) used as a 'safelight' while working in a darkroom, as it does not expose most photographic paper and some films. Films simulating the effects of infrared film (such as Ilford's SFX 200) do so by being much more sensitive to red than to other colors. For example, combined with a polarizer, it can turn the sky black.

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As used in computer monitors and television screens, red is very variable, but some systems may apply color correction (so that a standardized 'red' is produced that is not in fact full intensity of only the red colorant).Ī red filter used in black and white photography increases contrast in most scenes. In order to produce exact colors the color red needs to be defined in terms of an absolute color space such as sRGB. Because 'red' is not by itself standardized, color mixtures based on red are not exact specifications of color either. One common use of red as an additive primary color is in the RGB color model. Red is also one of the subtractive primary colors of RYB color space but not CMYK color space. Red is used as one of the additive primary colors of light, complementary to cyan, in RGB color systems. Red light is used to preserve night vision in low-light or night-time situations, as the rod cells in the human eye aren't sensitive to red. Red lasers, used in early compact disc technologies, are being replaced by blue lasers, as red's long wavelength causes the laser's recordings to take up more space on the disc than blue lasers. Longer wavelengths than this are called infrared, or below red and cannot be seen by human eyes. Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625–740 nm. Unsourced material may be challenged and removed.

Please help improve this article by adding reliable references. This section needs additional citations for verification. Red Indians is a British term for Native Americans, American terms for this ethnic group include redskin and red man, though they are not the preferred terms. The word is also obviously associated with anything of the color occupying the lower end of the visible light spectrum, such as red hair or red soil. After the rise of socialism in the mid-19th century, red was to describe revolutionary movements. Healthy persons are often said to have a redness (as opposed to appearing pale). Fire is also strongly connected, as is the sun and the sky at sunset.

In the English language, the word red is associated with blood, certain flowers ( i.e. This is the only color word which has been traced to an Indo-European root. Further back, the word can be traced to the Proto-Germanic rauthaz and the Proto-Indo European root reudh. The word red comes from the Old English read.