Quotation from: General Science

Written by: Bertha M. Clark


This method of indirect dyeing is known as the mordanting process; it
consists of saturating the fabric to be dyed with chemicals which will
unite with the coloring matter to form compounds unaffected by water.
The chemicals are called mordants.


229. How Variety of Color is Secured. The color which is fixed on
the fabric as a result of chemical action between mordant and dye is
frequently very different from that of the dye itself. Logwood dye
when used alone produces a reddish brown color of no value either for
beauty or permanence; but if the fabric to be dyed is first mordanted
with a solution of alum and oxalic acid and is then immersed in a
logwood bath, it acquires a beautiful blue color.

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