Widely used as a pH indicator in acid-base titrations, it turns colorless in acidic solutions and pink to deep red in basic solutions, typically above pH 8.2. This makes it ideal for detecting the endpoint in titrations involving strong acids and strong bases. It is commonly used in educational laboratories for teaching neutralization reactions. Also employed in some industrial processes to monitor pH changes. Due to its clear visual transition, it is favored for quick qualitative analysis of alkalinity. However, it is not suitable for use in highly alkaline solutions where it may degrade and lose color.