Sodium 7-Amino-2-naphthalenesulfonate is primarily used as an intermediate in the production of dyes and pigments. It plays a crucial role in synthesizing azo dyes, which are widely applied in textile, paper, and leather industries for coloring purposes. Its sulfonate group enhances water solubility, making it suitable for dye formulations that require even distribution in aqueous solutions. Additionally, it is utilized in the manufacturing of fluorescent whitening agents, which are added to detergents and papers to improve brightness. In research, it serves as a reagent for studying chemical reactions and developing new colorants. Its stability and reactivity make it valuable in various industrial and laboratory applications.