Fluorescent brightener agents (FBAs) are optical brighteners that absorb ultraviolet light and emit blue light. They are colorless themselves but make white or light-colored materials appear whiter, brighter, and more vivid. FBAs bond firmly to fibers, providing long-lasting effects. They are widely used in textiles (e.g., cotton and polyester fabrics), papermaking, detergents, plastics, and coatings—commonly found in clothing, paper products, laundry detergents, and plastic items for enhanced whiteness and brightness.