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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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| What touched me were the lonely spaces in the music and the Yiddishkeit and mordancy in the music, which was familiar to me. Friedman's work has often had a sharp-edged humorous mordancy, which, however, is usually quite subtle. In Europa, Europa, Holland made an unnerving comedy about survival within the hell of race hatred, and her instinct to render her subject with equal measures of lyricism, mordancy, and gallows humor fulfills itself in the boy's nightmare of Stalin and Hitler waltzing together amid the havoc their ideologies perpetrate. |
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