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I inoculated nutrient agar with bacillus subtilis and it made a dark green colour on agar plates.
Agar is a gelatinous medium that provides nutrients and a stable, controlled environment for bacteria growth. Most bacteria will grow well using nutrient agar, but some more fastidious bacteria prefer tryptic soy agar. To prepare agar plates, just heat agar and pour it into a sterile petri dish. Swab along any surface to test (your mouth, the bathroom counter, etc.) and then lightly smear in a zig-zag pattern on the surface of the agar plates. Signs of bacteria growth should show within 1-2 weeks. Getting started: