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Meaning of sulfur dye

sul'fur dye"

Pronunciation: [key]
— Chem. Chem.
  1. any of the class of dyes produced by heating an organic compound, as an indophenol, with sulfur or sodium polysulfide, used chiefly in dyeing cotton.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.