Used as a pH indicator in acid-base titrations, particularly in the range of pH 3.1 to 4.4. It changes color from red in acidic solutions to yellow in basic solutions, making it useful for detecting the endpoint in strong acid-strong base titrations. Commonly employed in laboratories for educational purposes and in analytical chemistry to determine the acidity or alkalinity of solutions. Also used in microbiology as a component in some culture media to monitor pH changes during bacterial growth.