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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.sing neutral red pH indicator, the agar distinguishes those Gram-negative bacteria that can ferment the sugar lactose (Lac+) from those that cannot (Lac-). This medium is also known as an indicator medium and a low selective medium. Presence of bile salts inhibits swarming by Proteus species.