[AS.] A process consisting in fixing the color in cloth and other materials by immersing them in a prepared bath containing coloring substances. Dyes are obtained from animals, vegetables, and minerals, the different tints being secured by combining the requisite number of simple coloring substances with one another. In order to render the colors permanent; mordants are used. These consist chiefly of the salts of iron, alumina, and tin. With aniline and some otherdyes no mordant is required. Indigo is the chief of blue dye-stuffs ; quercitron and fustic dye yellow; and madder, log-wood, cochineal, and aniline dyes are the most common red dyes.