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British Dictionary definitions for direct dye

direct dye

noun
  1. any of a number of dyes that can be applied without the use of a mordant. They are usually azo dyes applied to cotton or rayon from a liquid bath containing an electrolyte such as sodium sulphate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012