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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. |
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The story is brutal if sometimes mordantly funny in its take-no-prisoners kind of way: as Mausape's friend Hoss reflects, "Sometimes it was a good day to die; sometimes it was a good day to fuck. In September, first-time feature director Georgia Lee makes sure that door stays wide-open with the theatrical release of Red Doors, a mordantly funny and touching ensemble family drama that premiered in 2005 at the Tribeca Film Festival and made an award-winning tour of the film festival circuit last year. The three-disc set (each volume with its own deluxe jacket containing the disc and a short brochure) includes Debord's six films in chronological order, his collaborative video with Cornand, two mordantly ironic trailers, and a volume of documents related to the films. |
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mordantly
