Widely used as a fluorescent whitening agent, this compound enhances the brightness and whiteness of materials by absorbing ultraviolet light and re-emitting it as blue visible light. It is commonly incorporated into coatings, plastics, and synthetic fibers to improve visual clarity and color appearance. Its stability under heat and light makes it suitable for high-temperature processing applications. Additionally, it finds use in optical brightening of paper and textiles, where a clean, bright finish is desired. The zinc complex structure contributes to improved photostability compared to some organic-only fluorophores, allowing longer performance life in outdoor applications.