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I inoculated nutrient agar with bacillus subtilis and it made a dark green colour on agar plates.
Agar may be made out of varieties of red algae; the most popular one is the Ceylon moss. Agar is a gelatinous substance made out of the pigment and subunits of the polymeric red algae. Agar is also water soluble-it can absorb water at certain amount and form a solid film.