4,5-Dichloroaniline-2-sulfonic acid is primarily used as an intermediate in the synthesis of dyes and pigments. It plays a crucial role in the production of azo dyes, which are widely utilized in the textile industry for coloring fabrics. Its sulfonic acid group enhances water solubility, making it suitable for dye formulations that require even distribution and adherence to fibers. Additionally, it is employed in the manufacture of colorants for paper, leather, and plastics. Its chemical structure allows for the creation of vibrant and stable colors, making it a valuable component in industrial dye processes.