o-Toluidine is primarily used in the production of dyes and pigments, particularly for creating vibrant colors in textiles, paper, and leather. It serves as an intermediate in the synthesis of various azo dyes, which are widely employed in the printing and dyeing industries. Additionally, it is utilized in the manufacture of rubber chemicals, helping to improve the properties of vulcanized rubber products. In the pharmaceutical sector, o-Toluidine acts as a precursor in the synthesis of certain drugs and organic compounds. It also finds application in chemical research as a reagent for analytical purposes, such as detecting nitrites in water and other substances. However, due to its toxicity and potential health risks, strict safety measures are required during its handling and use.