o-Phenetidine Hydrochloride is primarily used in the synthesis of various dyes and pigments, particularly azo dyes, which are widely employed in the textile industry for coloring fabrics. It serves as an intermediate in the production of these dyes, contributing to their vibrant and stable color properties. Additionally, it finds application in the pharmaceutical industry, where it is utilized as a precursor in the synthesis of certain drugs and organic compounds. Its role in research and development is also notable, as it is used in chemical studies and experiments to explore new reactions and compounds. Handle with care, as prolonged exposure may pose health risks due to potential toxicity.