Optical brightener chemical name is fluorescent or optical brightening agents, are chemical compounds used in various industries, including textiles, detergents, and paper, to improve the brightness and appearance of materials. These brighteners work by absorbing invisible ultraviolet light and converting it into visible blue light, which enhances the whiteness and brightness of the material, making it appear cleaner and more vibrant. Optical brighteners are commonly added to laundry detergents to make clothes appear whiter and brighter after washing. In the textile industry, they enhance the brilliance of fabrics, while in the paper industry, they improve the whiteness of papers and other printing materials.