Used as a mixed pH indicator in acid-base titrations, particularly for analyzing alkalinity in water and wastewater, and in the Kjeldahl method for nitrogen determination. The combination of bromocresol green and methyl red provides a sharp color change from red to green over a pH range of approximately 4.4 to 5.4, ideal for detecting endpoints in titrations of weak bases, carbonates, or ammonia with strong acids. Commonly employed in standard methods for total alkalinity in environmental and industrial samples. Also used in microbiology as a component in certain culture media to monitor pH changes during fermentation processes.