Used as a selective growth medium indicator in microbiology, particularly for detecting fermentation of carbohydrates by bacteria. The formulation supports bacterial growth while the bromcresol purple acts as a pH indicator, changing color in response to acid production during fermentation. Commonly used in diagnostic procedures to differentiate bacterial species based on their metabolic activity, especially in identifying coliforms and other gram-negative organisms. Suitable for use in quality control testing in food, water, and clinical laboratories.