In view of the vast array of coal tar colors now at our disposal, and
their almost universal application in the decoration of all manner of
textile fabrics, threatening even the continued use of well known
dyestuffs of vegetable origin, it becomes of the greatest importance
to examine most thoroughly, and to compare the stability of both old
and new coloring matters.
The first point in discussing this question of fast and fugitive dyes
is to define the meaning of these terms "fast" and "fugitive."
Unfortunately, as frequently employed, they have no very definite
signification. The great variety of textile fabrics to which coloring
matters are applied, the different stages of manufacture at which the
coloring matter is applied, and the many uses to which the fabrics are
ultimately put, all these are elements which cause dyed colors to be
exposed to the most varied influences.
The term a "fast color," then, may convey a different meaning to
different individuals. To one it implies that the color will not fade
when exposed to light and atmospheric conditions; to another that it
is not impoverished by washing with soap and water; to a third it may
indicate that the color will withstand the action of certain
manufacturing operations, such as scouring, milling, stoving, etc.
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