Used primarily as an acid-base indicator in analytical chemistry, it changes color in response to pH shifts, making it valuable in titration experiments. It is especially effective in detecting the endpoint in strong acid-strong base titrations, where it turns from colorless to pink in basic conditions. Due to its clear visual transition, it is also employed in educational laboratories for teaching pH concepts. Additionally, it has been used in some medical tests to assess liver function and in the formulation of certain laxatives, though such uses are less common today.