Indigo

(redirected from indigos)
Also found in: Dictionary, Thesaurus, Medical.
Related to indigos: Indigo children

indigo

[Span.; from Lat.,=Indian], important blue dyestuff used in printing inks and for vat dyeing of cotton (see dyedye,
any substance, natural or synthetic, used to color various materials, especially textiles, leather, and food. Natural dyes are so called because they are obtained from plants (e.g., alizarin, catechu, indigo, and logwood), from animals (e.g.
..... Click the link for more information.
). It was anciently produced in India and was known in Egypt, probably c.1600 B.C.; mummies of the XVIII dynasty have been discovered wrapped in indigo-dyed cloth. Indigo is obtained from leguminous plants of the genus Indigofera, chiefly from the Asian species Indigofera tinctoria, but also from several other species. The plants contain a colorless, soluble glucoside called indican. When the macerated plants are allowed to ferment in vats of water the colorless form of indigo is liberated; stirring of the liquid causes oxidation of the colorless material to form a blue sediment. The natural indigo gives a strong blue color of great permanence. Use of the natural dye greatly decreased after the synthesis of indigo was accomplished. Adolf von Baeyer was the first to synthesize it, but others developed the methods used for its commercial production from anilineaniline
, C6H5NH2, colorless, oily, basic liquid organic compound; chemically, a primary aromatic amine whose molecule is formed by replacing one hydrogen atom of a benzene molecule with an amino group.
..... Click the link for more information.
 and chloroacetic acid.

Indigo

 

plants containing the glycoside indican, the source of blue indigo dye. Only a few indigo plants contain a sufficient quantity of indican for practical use. The most important indigo plant is Indigofera tinctoria, which is native to southern Asia and was once widely cultivated. After the synthesis of indigo, the significance of this and other indigo plants decreased sharply. In the USSR the species Isatis tinctoria and Polygonum tinctoria are occasionally cultivated


Indigo

 

a dark blue crystalline substance; its structural formula is Its melting point is 390°-392°C (with decomposition). It is insoluble in water and alcohol and slightly soluble in other organic solvents.

Indigo, which has been known since remote antiquity, is a dye obtained from indigo plants (for example, Indigofera tinctoria); it is extensively used for vat dyeing cotton and silk blue. The principal method of obtaining indigo is by reacting aniline with chloroacetic acid to give phenylglycine, which is then fused with alkali to give indoxyl, which in turn is oxidized to indigo by the oxygen in the air. Reduction of indigo gives the leuco compound indigo white, whose sodium salt of sulfuric acid ester is called indigosol. Owing to the inadequate durability of indigo, it has been replaced by other vat dyes. The determination of the structure of indigo and development of methods of synthesizing it at the end of the 19th century was the start of the development of the manufacture of indigoid dyes.

IU. E. GERASIMENKO

indigo

[′in·də·gō]
(organic chemistry)
A blue dye extracted from species of the Indigofera bush.

indigo

1. any of various tropical plants of the leguminous genus Indigofera, such as the anil, that yield this dye
2. 
a. any of a group of colours that have the same blue-violet hue; a spectral colour
b. (as adjective): an indigo carpet

Indigo

(1) An earlier family of desktop graphics computers from SGI. The low end were the Indy machines, which included their own digital video camera. The high end included a variety of Indigo workstations, with models specialized for graphics functions such as accelerated texture mapping and image processing. See SGI.

(2) The code name of the messaging system introduced in Windows Vista. See Windows Communication Foundation.
References in periodicals archive ?
We got there and started banging on dressing-room doors, bringing people up on stage,'' said Emily Saliers who with partner Amy Ray make up the Indigos.
Indigos DRUPA exhibition stand spans some 1,700 square meters (18,000 square feet) and features two dozen Digital Offset Color presses in a &uot;production arcade&uot; as well as a 300-seat theater.
This agreement substantially extends and expands the business relationship between Indigo and MSA.
Indigo, founded in 1996, is a leading developer and supplier of a wide range of cooled and uncooled infrared detectors, camera cores and finished cameras.
Estimated Indigo revenue for calendar year 2003 is approximately $55.
Indigo Software, leader in SIP (Session Initiation Protocol) -based instant communication solutions, and Aquanta Networks, leader in dataflow management for communication services, today announced their mutual commitment to a new partnership.
Indigo Software, the leading provider of SIP-based products and solutions for converged networks, today announced the appointment of Brian Gray to the position of President and Chief Executive Officer.
Indigo Software, the leading provider of SIP-based solutions, has today announced their strategic partnership with the French company Alertim, the most prominent European provider of push solutions.
Indigo Systems Corporation, a leading provider of high-performance infrared (IR) cameras and technology for commercial, industrial and military applications, announced today that it has secured $17.
Indigo Software, a leader in real-time communications software development based on Session Initiation Protocol (SIP), and Convedia Corporation, a leading provider of multi-protocol media servers, announced today they have entered into a partnership that will deliver to service providers and enterprises the ability to make use of presence information in multimedia collaborative applications.