Quotation from: General Science

Written by: Bertha M. Clark


226. Wool and Cotton Dyeing. If a piece of wool is soaked in a
solution of a coal-tar dye, such as magenta, the fiber of the cloth
draws some of the dye out of the solution and absorbs it, becoming in
consequence beautifully colored. The coloring matter becomes "part and
parcel," as it were, of the wool fiber, because repeated washing of
the fabric fails to remove the newly acquired color; the magenta
coloring matter unites chemically with the fiber of the wool, and
forms with it a compound insoluble in water, and hence fast to
washing.

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