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In my experiment, I had white colonies initially and they turned yellow. So I thought it´s natural that mature E. coli colonies are yellow and young are white. But it could be that I had two types of E. coli and the yellow one just dominated the white.

I research the affect of vitamin C on susceptibility of E. coli to H2O2. First I treat bacteria with vitamin C, incubate for an hour and H2O2.

enter image description here That is what I have on all of the plates. It really seems like there are 2 species present.

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  • $\begingroup$ Can you please add more information about the experiment that you are doing? $\endgroup$
    – jakebeal
    Jun 22 at 15:06
  • $\begingroup$ It would be really helpful if you could attach pictures of experiment results. $\endgroup$ Jun 22 at 15:42

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