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mordant |
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mordant (môr`dənt) [Fr.,=biting], substance used in dyeing to fix certain dyes (mordant dyes) in cloth. Either the mordant (if it is colloidal) or a colloid produced by the mordant adheres to the fiber, attracting and fixing the colloidal mordant dye (see colloid colloid (kŏl`oid) [Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and ..... Click the link for more information. ); the insoluble, colored precipitate that is formed is called a lake lake, in dyeing, an insoluble pigment formed by the reaction between an organic dye and a mordant . The color of a lake depends upon the mordant as well as the dye used. Generally, lakes are not as colorfast as many inorganic dyes, but their colors are more brilliant. ..... Click the link for more information. . The chemical compounds used as mordants are either acidic or basic. Acid mordants (e.g., tannic acid) are employed with basic dyes; basic mordants (e.g., alum, chrome alum, and certain salts of aluminum, chromium, copper, iron, potassium, and tin) are employed with acid dyes. Cloth to be dyed may be treated first with the mordant and then with the dye, or the mordant and dye may be applied together. The vividness of certain dyes that ordinarily do not require the use of a mordant may be markedly increased when one is employed. mordant [′mȯrd·ənt] (chemistry) An agent, such as alum, phenol, or aniline, that fixes dyes to tissues, cells, textiles, and other materials by combining with the dye to form an insoluble compound. Also known as dye mordant. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| "I quite agree," said Miss Lavish, who had several times tried to interrupt his mordant wit. asked the Portuguese, in the same tone of mordant irony. So vivid and mordant was the impression that I can live over again that slow descent of the station hill, the passing by the nurse-girl with the two babes, the sight of the old horse on his knees between the shafts, the cabman twisted across his seat, and the young man inside with his hand upon the open door in the very act of springing out. |
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