Used primarily as a complexometric indicator in analytical chemistry, particularly in the titration of metal ions such as calcium and magnesium. It forms colored complexes with these ions, allowing for precise endpoint detection in EDTA titrations. Commonly applied in water hardness testing, where it helps determine the concentration of metal ions in water samples. Additionally, it finds use in industrial processes for monitoring metal ion concentrations in various solutions. Its stability and distinct color change make it a reliable choice for such applications.