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Indigo dye is a greenish dark blue color, obtained from either the leaves of the tropical Indigo plant ( Indigofera ), or from woad ( Isatis tinctoria ), or the Chinese indigo ( Persicaria tinctoria ). Many societies make use of the Indigofera plant for producing different shades of blue.
Indigo dye is an organic compound with a distinctive blue color. Indigo is a natural dye extracted from the leaves of some plants of the Indigofera genus, in particular Indigofera tinctoria . Dye-bearing Indigofera plants were commonly grown and used throughout the world, particularly in Asia, with the production of indigo dyestuff economically ...
It is an approximation of the color violet at about 400 nanometers as plotted on the CIE chromaticity diagram, in the middle of the violet range of from 380 nanometers to 420 nanometers, assuming indigo as a separate spectrum color from 420 to 450 nanometers. Other names for this color are middle violet or simply violet.
ROYGBIV is an acronym for the sequence of hues commonly described as making up a rainbow: red, orange, yellow, green, blue, indigo, and violet. There are several mnemonics that can be used for remembering this color sequence, such as the name "Roy G. Biv" or sentences such as "Richard of York Gave Battle in Vain". History
Persian blue comes in three major tones: Persian blue proper: a bright medium blue; medium Persian blue (a medium slightly grayish blue that is slightly indigoish); and a kind of dark blue which is referred to as Persian indigo, dark Persian blue, or regimental, that is much closer to the web color indigo.
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Brown. Brown colors are dark or muted shades of reds, oranges, and yellows on the RGB and CMYK color schemes. In practice, browns are created by mixing two complementary colors from the RYB color scheme (combining all three primary colors). In theory, such combinations should produce black, but produce brown because most commercially available ...
Indigo dye Color coordinates; Hex triplet #091F92: sRGB B (r, g, b) (9, 31, 146) HSV (h, s, v) (230°, 94%, 57%) CIELCh uv (L, C, h) (20, 70, 264°) Source: Gallego and Sanz: ISCC–NBS descriptor: Vivid blue: B: Normalized to [0–255] (byte)
Comparing Newton's observation of prismatic colors with a color image of the visible light spectrum shows that "indigo" corresponds to what is today called blue, whereas his "blue" corresponds to cyan.
Indigofera sumatrana Gaertn. Indigofera tinctoria Blanco. Indigofera tulearensis Drake. Indigofera tinctoria [2], also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye .
Hues of blue include indigo and ultramarine, closer to violet; pure blue, without any mixture of other colours; Azure, which is a lighter shade of blue, similar to the colour of the sky; Cyan, which is midway in the spectrum between blue and green, and the other blue-greens such as turquoise, teal, and aquamarine .
