For used in the brewery industries and for the differentiation of wild yeasts from brewer’s strains. SCHWARZ DIFFERENTIAL MEDIUM is used for used in the brewery industries and for the differentiation of brewing yeasts. The medium contains Beef extract, Malt extract, Yeast extract and Peptic digest of animal tissue as sources of nitrogen, B- complex other vitamins, amino acids and carbon compounds for potential microorganism’s growth. Sodium sulphite and Basic fuchsin inhibit the gram positive microorganisms. Dextrose is a fermentable carbohydrate. Dextrin is also a carbohydrate source which helps in metabolism Agar is a solidifying agent.