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dye, 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., cochineal, kermes, and Tyrian purple), and from certain naturally occurring minerals (e.g., ocher and Prussian blue). They have been almost entirely replaced in modern dyeing by synthetic dyes. Most of these have been prepared from coal tar or petroleum, being formed from an aromatic hydrocarbon such as benzene, from which indigo is derived (see also aniline), or anthracene, which yields alizarin.

Although some materials, e.g., silk and wool, can be colored simply by being dipped in the dye (the dyes so used are consequently called direct dyes), others, including cotton, commonly require the use of a mordant (see also lake). Alizarin is a mordant dye and the color it gives depends upon the mordant used. Dyes are classified also as acidic or basic according to the medium required in the dyeing process. A vat dye, e.g., indigo, is so called from the method of its application; it is first treated chemically so that it becomes soluble and is then used for coloring materials bathed in a vat.

When the materials become impregnated with the dye, they are removed and dried in air, the indigo reverting to its original, insoluble form. The process by which a dye becomes “attached” to the material it colors is not definitely known. One theory holds that a chemical reaction takes place between the dye and the treated fiber; another proposes that the dye is absorbed by the fiber.

Dyeing is an ancient industry. The ancient Peruvians, Chinese, Indians, Persians, Phoenicians, and others used natural dyes many centuries ago, including indigo, one of the oldest dyes in use, and Tyrian purple, derived from several species of sea snail. The Egyptians prepared some brilliant colors. In the 13th and 14th cent. dyeing assumed importance in Italy; the methods employed were carried to other parts of Europe and, as new dyes became known, the dyeing industry flourished and grew. Cochineal was introduced from Mexico. Finally, in the 19th cent. the work of W. H. Perkin and Adolf von Baeyer produced the first synthetic dyes.


See S. Robinson, The History of Dyed Textiles (1970); H. Zollinger, Color Chemistry: Syntheses, Properties, and Applications of Organic Dyes and Pigments (1987); D. R. Waring and G. Hallas, ed., The Chemistry and Application of Dyes (1989).

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A colored substance which imparts more or less permanent color to other materials. Also known as dyestuff.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


A coloring material or compound that imparts color throughout a material by penetration.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Determination of adsorptive properties of a Turkish sepiolite for removal of reactive blue 15 anionic dye from aqueous solutions.
Starch also aids in the function of chitosan as it also contains amylose chains that are helpful in attracting anionic dye molecules and other minerals (Szygula et al., 2009; Miller et al., 2008).
Li, "Adsorption of anionic dyes in acid solutions using chemically cross-linked chitosan beads," Dyes and Pigments, vol.
This study investigated the equilibrium and the dynamics the adsorption of an anionic dye, which is namely Acid Orange 8 dye, AO8, onto unmodified zeolite (ZFA and ZBA) and modified zeolite (MZSF and MZSB) that were synthesized from coal fly and bottom ash, respectively.
Darragi et al., "Efficient anionic dye adsorption on natural untreated clay: kinetic study and thermodynamic parameters," Desalination, vol.
The concentration of anionic dye injection solutions was 100 [micro]/mL in methanol.
Tushar, Removal of anionic dye by raw pine and acid-treated pine cone powder as adsorbent: Equilibrium, thermodynamic, kinetics, mechanism and Process design, J.Water research, 461, 933 (2012).
Zhao, "Adsorption study for removal of Congo red anionic dye using organo-attapulgite," Adsorption, vol.
It has been proven that the affinity of MAC to cationic dyes is much higher than that to anionic dyes. Hence, the MAC has been coated with HMT-STA-MB instead of HMT-STA because the surface charge of HMT-STA is negative due to the existence of silicotungstate.
This dye (AB25) is also called anionic dye because it has -ve structure of the chromophore group.
Methyl orange, an anionic dye has been used as a probe to study the mode and the extent of complex formation between small molecules, proteins and water-soluble polymers [9].
Reliability and Validation for the Anionic Dye Method