Used as a pH indicator in various laboratory applications, particularly in titrations to determine the acidity or alkalinity of solutions. It is effective in the pH range of 8.2 to 9.8, where it changes color from colorless to pink, making it suitable for detecting endpoints in weak acid-strong base titrations. Additionally, it is employed in biochemical assays and medical diagnostics to measure enzyme activity or monitor reactions that depend on pH changes. Its stability and clear color transition make it a reliable tool in analytical chemistry and research.