a chemical or other agent used to increase brightness, as one added to toothpaste or detergent to intensify the cleansing or bleaching process.
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Of the specialty detergents, I’ve used Assos extensively, and find that it does an excellent job on synthetics, especially for preserving color, since it has optical brighteners.
That epoch, to which I have looked forward as the brightener of my every view upon earth—how is it now clouded!'
But chaperonage was far from the whole destiny of a Brightener.
Mine was to gird my loins at Lucille's and Redfern's, in order to become a Brightener.
But I felt that my reputation as a Brightener was at stake, with Terry's hopes.
Gille Machree, "brightener of my heart;" the name of one of Gerald Griffin's sweetest songs.