brightener

Noun

 * 1) One who or that which brightens.
 * 2) A chemical agent that absorbs ultraviolet and violet light and re-emits blue light by fluorescence, used to make fabric or paper look whiter.
 * 3)  Any substance added to an electrolytic bath to yield a brighter electroplated surface.
 * 1) A chemical agent that absorbs ultraviolet and violet light and re-emits blue light by fluorescence, used to make fabric or paper look whiter.
 * 2)  Any substance added to an electrolytic bath to yield a brighter electroplated surface.