The color box at right displays the web color Indigo which is equivalent to pigment indigo, the color indigo as it would be reproduced by artists' paints as opposed to the brighter indigo above (electric indigo) that it is possible to reproduce on a computer screen. Pigment indigo (web color indigo) Pigment Indigo Others continue to accept it as it has been accepted traditionally as one of Newton's named colors of the spectrum along with red, orange, yellow, green, blue, and violet.ĭeep indigo (web color blue-violet) Blue-VioletĪt right is displayed the web color blue-violet, a color intermediate in brightness between electric indigo and pigment indigo. Color scientists typically divide the spectrum at about 450 nm between violet and blue, with no indigo. For this reason, some commentators, including Isaac Asimov, have suggested that indigo should not be regarded as a color in its own right but merely as a shade of blue or violet. Humans do not tend to recognize indigo as a separate hue category between blue and violet. He specifically named seven colors primarily to match the seven notes of a western major scale, because he believed sound and light were physically similar, but also to link colors with the (known) planets, days of the week, and other lists that had seven items. It was named and defined by Isaac Newton when he divided up the optical spectrum (which is a continuum of frequencies). Indigo is neither an additive primary color nor a subtractive primary color. It is impossible to represent spectrum indigo exactly on a computer screen, because true spectrum indigo is outside the color triangle or gamut of the RGB color space defined by the monitor primaries. Spectrum Indigo fits nicely between spectrum violet and spectrum blue as can be seen in the color bands displayed below. It is much brighter than the pigment indigo reproduced below. This sample was taken directly from the CIE chromaticity diagram opposite the 430 nanometer line. Spectral indigo is closely approximated by the color electric indigo. In an RGB color space, spectral indigo and violet must be approximated by purples, that is, by mixing a little red with a lot of blue. When specifying the color indigo, it is necessary to indicate which particular one of these four major shades of indigo you are referring to. A vat full of this dye is a darker color, approximating the web color Midnight Blue. This is the actual color of the dye from the indigo plant when swatched onto raw fabric. The color of indigo dye is a different color than either spectrum indigo or pigment indigo. The color pigment indigo is equivalent to the web color indigo and approximates the color indigo that is usually reproduced in pigments and colored pencils. The web color blue violet or deep indigo is a shade of indigo brighter than pigment indigo but not as bright as electric indigo. This is the brightest color indigo that can be approximated on a computer screen-it is the color between the web color blue and the color electric violet. The color electric indigo is an approximation of spectrum indigo. Like many other colors ( orange and violet are the best-known), indigo gets its name from an object in the natural world-the plant named indigo once used for dyeing cloth (see also Indigo dye). 1.2 Deep indigo (web color blue-violet)ĭistinction between four shades of indigo.1 Distinction between four shades of indigo.
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