Widely used as a fluorescent whitening agent in detergents, Disodium 4,4'-Bis(2-sulfonatostyryl)biphenyl enhances the brightness and whiteness of fabrics by absorbing ultraviolet light and emitting blue light. It is effective in laundry applications, especially in low-temperature wash cycles, and is compatible with various surfactants and enzymes found in modern cleaning formulations. Also employed in paper manufacturing to improve the optical appearance of white paper products. Its strong affinity for cellulose fibers ensures good retention during processing. Additionally, it finds use in some textile treatments to maintain vibrant color and reduce yellowing over time.