KSN is a high-efficiency water-soluble fluorescent whitening agent, which belongs to the class of stilbenes. With its excellent fluorescent properties, the reagent is widely used in paper, textile, detergent, soap and many other industries where whiteness and brightness are critical. Known for its excellent whitening effect, KSN can effectively absorb ultraviolet rays and convert them into visible blue light, thereby improving the whiteness and brightness of the products it is applied to. This results in a visually appealing appearance and improves overall product quality. KSN has a chemical formula of C36H34N12Na2O8S2, a molecular weight of 872.84 g/mol, and exhibits excellent stability over a wide range of pH values, making it suitable for various manufacturing processes. In addition, its water solubility further provides ease of application, ensuring seamless integration into different production lines.