Used as a pH indicator in various laboratory applications to determine the acidity or alkalinity of solutions. It is particularly useful in biological and chemical research for monitoring pH changes in experiments. The solution changes color in response to pH levels, typically transitioning from red in acidic conditions (pH 1.2) to yellow in slightly acidic to neutral conditions (pH 2.8), and finally to purple in alkaline conditions (pH 8.2). This makes it a valuable tool in titrations, cell culture studies, and environmental testing. It is also employed in microbiology for preparing pH-adjusted media to support the growth of specific microorganisms.