Clorox 2™ for Colors Stain Remover and Color Brightener Powder, 49.2 Ounce Box, 49.2 Ounce Box (Package May Vary)

Fluorescent Brightener 71 is an optical brightener, which is added to laundry detergents to help whiten and brighten fabrics, making them look especially clean. These are also known as fluorescent whitening agents. Such compounds absorb invisible ultraviolet light and re-emit light in the visible range (often with a bluish or reddish hue).