Used in microbiology laboratories to isolate and identify sulfite-reducing bacteria, particularly Clostridium species. The medium supports the growth of anaerobic bacteria and contains sulfite compounds that react with bacterial metabolism to form black or dark colonies due to the production of hydrogen sulfide. This color change helps in the rapid detection and differentiation of sulfite-reducing organisms from other bacteria. Commonly used in food safety testing, environmental monitoring, and clinical diagnostics to detect potential pathogens like Clostridium perfringens.