Sulfur dyes are inexpensive complex reaction mixtures of
selected aromatic compounds with sodium polysulfide.The sulfur dyes are
chemically reduced in the presence of base prior to appl ication to the
fiber, and are reoxidized after dyeing on the fiber by oxygen in the air or
by application of a mild oxidizing agent such as hydrogen peroxide.
The sulfur dyes are similar in application and fiber affinity to vat dyes,
and also are available in a solubilized leuco form:
Sulfur dyes are inexpensive, and have adequate colorfastness properties for
most applications.
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