"engineers and support corps normally had a single branch colour, although exceptionally each regiment of Swedish artillery had its own facing colour until 1910. The United States regular army after the American Civil War adopted a universal dark and light blue uniform under which each regiment was distinguished only by numbers and other insignia, plus branch colors. The latter were yellow for Cavalry, red for Artillery and white (later light blue) for infantry. Combinations of colors such as scarlet piped with white for Engineers, orange piped with white for the Signal Corps and black piped with scarlet for Ordnance personnel"
"Green Green is the color between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495570 nm. In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and blue, or yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. By far the largest contributor to green in nature is chlorophyll, the chemical by"
"is the most popular colour, chosen by almost half of both men and women as their favourite colour. The same surveys also showed that blue was the colour most associated with the masculine, just ahead of black, and was also the colour most associated with intelligence, knowledge, calm and concentration. Blue is the colour of light between violet and green on the visible spectrum. Hues of blue include indigo and ultramarine, closer to violet; pure blue, without any mixture of other colours; Cyan, which is midway in the spectrum between blue and green, and the other blue-greens turquoise, teal, and"
"Violet (color) Violet is the color at the end of the visible spectrum of light between blue and the invisible ultraviolet. Violet color has a dominant wavelength of approximately 380-450 nanometers. Light with a shorter wavelength than violet but longer than X-rays and gamma rays is called ultraviolet. In the color wheel historically used by painters, it is located between blue and purple. On the screens of computer monitors and television sets, a color which looks similar to violet is made, with the RGB color model, by mixing red and blue light, with the blue twice as bright as the"
"yourself [many wreaths] of violets and roses."" Violet (color) Violet is the color at the end of the visible spectrum of light between blue and the invisible ultraviolet. Violet color has a dominant wavelength of approximately 380-450 nanometers. Light with a shorter wavelength than violet but longer than X-rays and gamma rays is called ultraviolet. In the color wheel historically used by painters, it is located between blue and purple. On the screens of computer monitors and television sets, a color which looks similar to violet is made, with the RGB color model, by mixing red and blue light, with"
"color wheel used by painters, violet and purple are both placed between red and blue. Purple occupies the space closer to red, between crimson and violet. Violet is closer to blue, and is usually less saturated than purple. While the two colors look similar, from the point of view of optics there are important differences. Violet is a spectral color – it occupies its own place at the end of the spectrum of light first identified by Isaac Newton in 1672, and it has its own wavelength (approximately 380–420 nm) – whereas purple is a combination of two spectral colors,"
"Blue Blue is one of the three primary colours of pigments in painting and traditional colour theory, as well as in the RGB colour model. It lies between violet and green on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colors; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called Tyndall scattering explains blue eyes."
"most national and corporate leaders. Violet is at one end of the spectrum of visible light, between blue and the invisible ultraviolet. It has the shortest wavelength of all the visible colors. It is the color the eye sees looking at light with a wavelength of between 380 and 450 nanometers. In the traditional color wheel used by painters, violet and purple lie between red and blue. Violet is inclined toward blue, while purple is inclined toward red. Violet colors composed by mixing blue and red light are within the purple colors (the word ""purple"" is used in the common"
"Visible spectrum The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 700 nanometers. In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz. The spectrum does not contain all the colors that the human eyes and brain can distinguish. Unsaturated colors such as pink, or purple variations like magenta, for example, are absent because they can only be made from a"
"human eye, and is very eye-catching. For this reason many emergency vehicles and uniforms exhibit green-yellow. ""Harlequin"" is a color described as being located between green and yellow (closer to green than to yellow) on the color wheel. On color plate 17 in the 1930 book ""A Dictionary of Color"" (see reference below), the color ""harlequin"" is shown as being a highly saturated rich color at a position halfway between chartreuse and green. Thus in modern color terminology, harlequin is the color halfway between green and chartreuse green on the RGB color wheel. The first recorded use of ""harlequin"" as"
"as plotted on the CIE chromaticity diagram, in the middle of the violet range of from 420 nanometers to 380 nanometers, assuming indigo as a separate spectrum color from 450 to 420 nanometers. Other names for this color are middle violet or simply violet. Displayed at right is the color vivid violet, a color approximately equivalent to the violet seen at the extreme edge of human visual perception. When plotted on the CIE chromaticity diagram, it can be seen that this is a hue corresponding to that of a visual stimulus of approximately 380 nm on the spectrum. Thus another"
"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 human eye sees red when it looks at light with a wavelength between approximately 625 and 740 nanometers. It is a primary color in the RGB color model and the light just past this range is called infrared, or below red, and cannot be seen by human eyes, although it can be sensed as heat. In the language of optics, red is the color evoked by light that stimulates neither the S"
"AD in the Metres of Boethius. If the visible spectrum is wrapped to form a color wheel, orange appears midway between red and yellow: Shades of orange In optics, orange has a wavelength between approximately 585 and 620 nm and a hue of 30° in HSV color space. In the RGB color space it is a secondary color numerically halfway between gamma-compressed red and yellow, as can be seen in the . The complementary color of orange is azure. Orange pigments are largely in the ochre or cadmium families, and absorb mostly blue light. Varieties of the color orange may"
"applications use electric indigo, because the color is positioned between blue and violet on the spectrum. Indigo Indigo is a deep and rich color close to the color wheel blue (a primary color in the RGB color space), as well as to some variants of ultramarine. It is traditionally regarded as a color in the visible spectrum, as well as one of the seven colors of the rainbow: the color between violet and blue; however, sources differ as to its actual position in the electromagnetic spectrum. The color indigo is named after the indigo dye derived from the plant ""Indigofera"
"the spectrum traditionally considered indigo, i.e., between 450 and 420 nanometers. This color is only an approximation of spectral indigo, since actual spectral colors are outside the gamut of the sRGB color system. At right is displayed the web color ""blue-violet"", a color intermediate in brightness between electric indigo and pigment indigo. It is also known as ""deep indigo"". The color box at right displays the web color indigo, the color indigo as it would be reproduced by artists' paints as opposed to the brighter indigo above (electric indigo) that is possible to reproduce on a computer screen. Its hue"
"remain closest to the side which is light, and red and violet edges remain closest to the side which is dark. At a certain distance, these edges overlap—and we obtain Newton's spectrum. When these edges overlap in a light spectrum, green results; when they overlap in a dark spectrum, magenta results. With a light spectrum (i.e. a shaft of light in a surrounding darkness), we find yellow-red colours along the top edge, and blue-violet colours along the bottom edge. The spectrum with green in the middle arises only where the blue-violet edges overlap the yellow-red edges. Unfortunately an optical mixture"
"ephemeral moving images, which could have triggered and reinforced ground breaking modes of thought, forms of representation, and belief in otherworldly realms. Visible light, a small portion of the electromagnetic spectrum, encompasses wavelengths between 380-750 nanometers, which humans perceive as the colors of the spectrum: red, orange, yellow, green, blue, indigo, and violet. Light behaves according to a well-defined set of rules: it travels in straight lines, unless otherwise refracted or reflected by another object, or curved by gravity. An eye is essentially a darkened chamber with a small hole in front that allows light to enter. The lens, just"
"is exactly halfway between white and black. The first recorded use of ""teal"" as a color name in English was in 1917. Blue-green Blue-green is a color that is a representation of the color that is between green and blue on a typical traditional old-fashioned RYB color wheel. ""Blue-green"" belongs to the cyan family of colors. Cyan, also called aqua, is the blue-green color that is between blue and green on a modern RGB color wheel. The modern RGB color wheel replaced the traditional old-fashioned RYB color wheel because it is possible to display much brighter and more saturated colors"
"or Pear gold, represented on Hunyadi coat of arms. If the visible spectrum is wrapped to form a color wheel, yellow (subtractive primary) appears midway between red and green: Shades of yellow Varieties of the color yellow may differ in hue, chroma (also called saturation, intensity, or colorfulness) or lightness (or value, tone, or brightness), or in two or three of these qualities. Variations in value are also called tints and shades, a tint being a yellow or other hue mixed with white, a shade being mixed with black. A large selection of these various colors is shown below. Displayed"
"lies halfway between green and spring green. It is very close to sea green, but highly saturated, and of a bright hue. In some traditional usage, red-violet is the name given to an intermediate or tertiary color that, along with yellow-orange (gold) and also green-blue (cyan), forms a color wheel triad group. Most contemporary usage, however, would list magenta as the name for the tertiary color in question. Red-violet or pigment purple (pigment red-violet) represents the way the color purple (red-violet) was normally reproduced in pigments, paints, or colored pencils in the 1950s on an old-fashioned RYB color wheel. This"
"visible spectrum. S cone cells can see short wavelength colours, which corresponds to violet and blue. Similarly, M cells detect medium wavelength colours, such as green and yellow, and L cells detect long wavelength colours, like red. L-M neurons, also called red-green opponent cells, receive input from long wavelength cones opposed by input from medium wavelength cones. S/(L+M) neurons receive input from S-cells and is opposed by a sum of the L and M-cell inputs. S/(L+M) neurons are also called blue-yellow opponent cells. The opposition between the colours allows the visual system to interpret differences in colour, which is ultimately"
"similar to this nebula are found near the band of the Milky Way galaxy in the night sky. The ""wreath"" is slightly off this band, near the boundary between the constellations of Perseus and Taurus, but at a relatively close distance of only about 1,000 light-years, the cloud is a still part of our Milky Way. The colors used in this image represent specific wavelengths of infrared light. Blue and cyan (blue-green) represent light emitted at wavelengths of 3.4 and 4.6 microns, which is predominantly from stars. Green and red represent light from 12 and 22 microns, respectively, which is"
"names do not necessarily agree with those in English. The division used by Isaac Newton, in his color wheel, was: red, orange, yellow, green, blue, indigo and violet; a mnemonic for this order is ""Roy G. Biv"". Less commonly, ""VIBGYOR"" is also used for the reverse order. In modern divisions of the spectrum, indigo is often omitted. One needs at least trichromatic color vision for there to be a distinction between spectral and non-spectral colours: trichromacy gives a possibility to perceive both hue and saturation in the chroma. In color models capable of representing spectral colors, such as CIELUV, a"
"Cyan Cyan ( or rarely, ) is a greenish-blue color. It is evoked by light with a predominant wavelength of between 490520 nm, between the wavelengths of green and blue. In the subtractive color system, or CMYK (subtractive), which can be overlaid to produce all colors in paint and color printing, cyan is one of the primary colors, along with magenta, yellow, and black. In the additive color system, or RGB (additive) color model, used to create all the colors on a computer or television display, cyan is made by mixing equal amounts of green and blue light. Cyan is"
"parts. The unstimulated part results in a violet afterimage. Yellow and violet are the complement of each other because together they add up to full retinal activity. Yellow is closer to white, so it activates the retina more than violet, which is closer to black. An orange color is not as close to white. It doesn't activate the retina as much as yellow. Orange's complement is blue, which is that much closer to white than was violet. A red color is halfway between white and black. Red's complement is green which is also halfway between white and black. With red"
"Red-violet Red-violet is a rich color of high medium saturation about 3/4 of the way between red and magenta, closer to magenta than to red. It is classified in color theory as one of the purple colors—a non-spectral color between red and violet that is a deep version of a color on the line of purples on the CIE chromaticity diagram. Both its saturation and brightness falling short of 100%, red-violet is not a pure chroma. There is a color of similar hue that, however, comes close to being a pure chroma: process magenta. The pure chroma color composed of"
"Chromosphere The chromosphere (literally, ""sphere of color"") is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep. The chromosphere's rosy red color is only apparent during eclipses. The chromosphere sits just above the photosphere and below the solar transition region. The layer of the chromosphere atop the photosphere is homogeneous. A forest of hairy-appearing spicules rise from the homogeneous layer, some of which extend 10,000 km into the corona above. The density of the chromosphere is only 10 times that of the photosphere, the layer beneath, and 10 times that"
"Spectral color A spectral color is a color that is evoked in a normal human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable. The spectrum is often divided into named colors, though any division is somewhat arbitrary; the spectrum is continuous. Traditional colors in English include: red, orange, yellow, green, blue, and violet. In some other languages the ranges corresponding to color"
"is because of the human visual sensitivity to different hues. Again, this shows how the human visual system is modeled through the Munsell Color Theory. With each of the dimensions defined, it is now possible to distinguish a color based on its Munsell Notation. Take for example the color 2.5YR 3/4. This color is between red and yellow-red, but closer to yellow-red, has a value of 3 which is closer to black, and has a chroma of 4. Munsell also wanted to create a standard way of measuring and viewing color. To do this, he investigated the relationship between the"
"between what we today call blue and violet. If this is where Newton meant indigo to lie, most individuals would have difficulty distinguishing indigo from its neighbors. According to Isaac Asimov, ""It is customary to list indigo as a color lying between blue and violet, but it has never seemed to me that indigo is worth the dignity of being considered a separate color. To my eyes it seems merely deep blue."" Modern color scientists typically divide the spectrum between violet and blue at about 450 nm, with no indigo. Like many other colors (orange, rose, and violet are the"
"specified. In the nineteenth century, the scientists Grassmann and Helmholtz did experiments in which they concluded that finding a good complement for spectral yellow was difficult, but that the result was indigo, that is, a wavelength that today's color scientists would call violet or purple. Helmholtz says ""Yellow and indigo blue"" are complements. Grassmann reconstructs Newton's category boundaries in terms of wavelengths and says ""This indigo therefore falls within the limits of color between which, according to Helmholtz, the complementary colors of yellow lie."" Newton's own color circle has yellow directly opposite the boundary between indigo and violet. These results,"
"color in question. The familiar colors of the rainbow in the spectrum—named using the Latin word for ""appearance"" or ""apparition"" by Isaac Newton in 1671—include all those colors that can be produced by visible light of a single wavelength only, the ""pure spectral"" or ""monochromatic"" colors. The table at right shows approximate frequencies (in terahertz) and wavelengths (in nanometers) for various pure spectral colors. The wavelengths listed are as measured in air or vacuum (see refractive index). The color table should not be interpreted as a definitive list—the pure spectral colors form a continuous spectrum, and how it is divided"
"between red and green, and blue and yellow. There has been considerable effort in neuroscience to establish physiological mechanisms correlating to the existence of unique hues. For some time it was thought that the opponent process was explained through two chromatic mechanisms inherent in the way signals from the three cone types (Long, Medium, and Short wavelengths) on the retina are processed. The first mechanism represents the red-green L-M process. The blue-yellow process was thought to be based on a similar (L+M)-S process. Recent research has shown that this (L+M)-S process does correspond to yellow as a unique hue. This"