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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 ...
Their color is an indigo blue, becoming paler with age or staining green with damage. The stem is 2–6 cm (0.8–2.4 in) tall by 1–2.5 cm (0.4–1.0 in) thick, and the same diameter throughout or sometimes narrowed at base. Its color is indigo blue to silvery- or grayish blue.
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.
Indigo dye. Several species, especially Indigofera tinctoria and Indigofera suffruticosa, are used to produce the dye indigo. Scraps of Indigo-dyed fabric likely dyed with plants from the genus Indigofera discovered at Huaca Prieta predate Egyptian indigo-dyed fabrics by more than 1,500 years.
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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.
The pigment was derived from crushed indigo plants. Indigo was a common source for haint blue prior to the American Revolution , when indigo was a common crop for plantations in the American South , but the tradition survived well after the decline in indigo dye cultivation.
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 .
Distinction among indigo, azure, and cyan. According to the logic of the RGB color wheel, indigo colors are those colors with hue codes between 255 and 225 (degrees), azure colors are those colors with hue codes between 195 and 225, and cyan colors are those colors with hue codes between 165 and 195.
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)
