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 colloidcolloid
[Gr.,=gluelike], a mixture in which one substance is divided into minute particles (called colloidal particles) and dispersed throughout a second substance. The mixture is also called a colloidal system, colloidal solution, or colloidal dispersion.
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); the insoluble, colored precipitate that is formed is called a lakelake,
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.
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. 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.
References in periodicals archive ?
mordantly revealed by Lazarescu's gradual helplessness, by his loss
Modernists are sufficiently praised, such as Denis Devlin and Brian Coffey, along with Thomas Kinsella, all of whom arouse his enthusiasm with contemporaries such as Randolph Healy, solely because of the "mordantly satirical in his treatment of nationalism" (109).
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These are mordantly funny, and it's unfortunate that Rey does not quote from them more extensively.
A corpse is mutilated, and in a mordantly funny scene, even a hedgehog comes to a grisly end.
IF telly's supposed to be about escapism, then I'm switching to radio.After a week which included mordantly depressing documentaries on underage pregnancies, binge drinking violence and an entire city addicted to crystal meth, I'm sure I saw rain clouds gathering above my TV.
The reality of the film's presentation of reality is based around the subversion of documentary traditions and cliches, but the world it depicts relies heavily on a fantastic, mordantly witty ethnographic version of Belgian society.
In this regard, the Shiva series was a departure from most of his other work, whose humour is mordantly dark in nature.
As one Israeli paper mordantly if accurately described it, Barak seemed considerably less friendly to her than Bashar Al Assad!
The latter derive chiefly from Dennis's papers at Stanford as well as information in FBI files (here, Horne mordantly remarks that the FBI seemed more interested in Dennis's racial origins than in his presumed subversive activities).
The band were famous for Morrissey's bleak but mordantly humorous lyrics and for Marr's distinctive melodic and jangly sound, which critics say helped return guitar-based music to popularity.