Used as a visual pH indicator in titrations, especially in the determination of alkalinity in water and wastewater samples. It provides a sharp color change from green to pink around pH 4.4–6.2, making it ideal for detecting the endpoint in acid-base titrations where precise pH transition is required. Commonly used in environmental labs for standardizing acids and analyzing carbonate and bicarbonate content in water systems. Its mixed formulation enhances color contrast, improving accuracy in manual titration readings.