A Popular Chemistry

Cover A Popular Chemistry
A Popular Chemistry
Steele, Joel Dorman, 1836-1886
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Such sub- stances are called mordants (mordeo, to bite), because they bind the dye in the cloth, thus making a "fast color." The most common mordants are alum, salts of tin and of iron. In dyeing, the cloth is first dipped into a solution of the mordant, and then into one of the dye-stuff. The mordant, by means of a stamp, may be applied to the cloth in the form of a pattern, and, when it is afterward washed, the color will be removed, except where the mordant fixed it in the printed figure. Th...e same dye will produce different colors by a change of mordants. — Example: Madder, with iron, gives a fine purple ; with alum, a pink ; and with iron and alum, a chocolate. This principle lies at the basis of dyeing "prints."* ♦ A calico printing-macliine is very complex. The cloth passes between a series of rollers, upon which the corresponding mordant is put, as ink is on type. A single machine sometimes prints from twenty sets of rollers ; yet each impression follows the other so accurately that, when the cloth haa passed through, the entire pattern is printed upon it, with the different mordants, more i)erfectly than any painter could do it^ and so rapidly that 236 ORGANIC CHEMISTRY.

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