By adopting this method, however, his selection would
ultimately comprise a large number of coloring matters paired with a
great variety of mordants. In order, therefore, to avoid the intricacy
involved in the use of several mordants, and to simplify the process
of dyeing, especially when dyeing compound shades, the dyer prefers to
limit himself as far as possible to the use of a single mordant, and
to employ along with it a mixture of several coloring matters.
Now the woolen dyer has largely adopted an excellent mordant in
bichromate of potash; it is cheap, easily applied, and not perceptibly
injurious to the fiber. It is his desire, therefore, to have a good
range of red, yellow, blue, and other coloring matters, all giving
fast dyes with this mordant. This action and desire on the part of the
dyer has more and more placed the problem of producing fast colors
upon the shoulders of the color manufacturer or chemist, and right
well has the demand been met, for in the diagram on the wall we see
how, in the alizarin colors and their allies, he has already furnished
the dyer with a goodly number of dyestuffs yielding fast dyes with
this chosen mordant of the woolen dyer. Since, however, they yield
fast colors with other useful mordants, and upon other fibers than
wool, these alizarin colors prove of the greatest value to the dyer of
textile fabrics generally.
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