Used as a pH indicator in analytical chemistry, particularly in titrations involving weak acids and strong bases. It changes color from yellow to red around pH 3.0 to 4.4, making it suitable for detecting the endpoint in certain acid-base reactions. Also employed in educational laboratories for demonstrating pH-dependent color changes. Due to its distinct color shift, it is sometimes used in mixture with other indicators to create universal indicators. Not recommended for biological or medical applications due to potential toxicity.