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I inoculated nutrient agar with bacillus subtilis and it made a dark green colour on agar plates.
Enteric bacteria that have the ability to ferment lactose can be detected using the carbohydrate lactose, and the pH indicator neutral red. MacConkey agar is one of the most common agar plates found in a clinical microbiology lab.t contains bile salts (to inhibit most Gram-positive bacteria), crystal violet dye (which also inhibits certain Gram-positive bacteria), neutral red dye (which turns pink if the microbes are fermenting lactose). Composition: 1  Peptone - 17 g. 2  Proteose peptone - 3 g.