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British Dictionary definitions for brightening agent

brightening agent

noun
  1. a compound applied to a textile to increase its brightness by the conversion of ultraviolet radiation to visible (blue) light, used in detergents
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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