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Food colored agar color change, does that mean bacteria?


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#1 Jrotten

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Posted 16 July 2020 - 09:11 PM

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.



#2 p2p

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Posted 16 July 2020 - 10:08 PM

The color can change as mycelium is eating the nutrients, but usually, the color would just get lighter, not change to a different color.


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