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optical brightener
op·ti·cal bright·en·er (plural op·ti·cal bright·en·ers)


noun 
Definition:
 
chemical color enhancer: a chemical substance used to make the whiteness or color of fabrics brighter, e.g. in laundry detergents
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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