Used in microbiology laboratories for the selective isolation and identification of enteric pathogens, particularly bacteria such as Salmonella and Shigella that require specific growth conditions. BL Agar Medium contains selective agents like brilliant green that inhibit the growth of Gram-positive bacteria and other non-target organisms, allowing for clear observation of target pathogen colonies. It differentiates lactose-fermenting and non-fermenting bacteria based on colony color and morphology. Commonly employed in diagnostic settings for clinical specimens, as well as in quality control for food, water, and pharmaceutical testing to detect gastrointestinal disease-causing microorganisms.