I read somewhere once that if you ad food coloring to your agar and it changes color when viewed from the back that means you have bacteria. I see it a lot with plates that seem otherwise perfect, especially if the donor agar was a different color than the receiving agar. It puts a constant shadow of doubt in my head and I'd really like to know if there is really any veracity to thi.
Food colored agar color change, does that mean bacteria?
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