Monosodium 3-Amino-2,7-naphthalenedisulfonate is widely used as an intermediate in the production of dyes and pigments, particularly in the synthesis of azo dyes, which are essential for coloring textiles, paper, and leather. Its sulfonate groups enhance water solubility, making it valuable in dye formulations that require even distribution and strong adherence to fabrics. Additionally, it serves as a key component in fluorescent brightening agents, improving the whiteness and brightness of materials like plastics, detergents, and papers. In research, it is utilized as a building block for developing advanced organic compounds due to its reactive amino and sulfonate functional groups.