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July 4, 2011

SULFUR DYE


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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