A water based, fluorescent optical brightener, Certified Color Brightener is an easy-to-use product that makes good cleaning look even better. Restores original luster and sheen to fabrics. Enhances brightness of whites and pastel shades and masks potential yellowing. . Improves appearance by coating the fibers. pH of use dilution 7-8. Also available in 55 Gallon Drums. Please call 800.443.4321 for quote.