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I inoculated nutrient agar with bacillus subtilis and it made a dark green colour on agar plates.
MacConkey's Agar Is Differential. MAC is also a differential, meaning that it differentiates or distinguishes between groups of bacteria on the basis of a color change reaction. MacConkeyâs contains two additives that make it differential; neutral red (a pH indicator) and lactose (a disaccharide).