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In the analysis of an unknown bacterial broth I observed a gram negative rod genus. Upon plating I observed small, dark purple and convex colonies; corresponding presumably to Chromobactierum. After then replating the purple colonies I then observed white fillamentous colonies that were gram negative and was subsequently able to make an identification that suggested the organism was either of genus aeromonas, vibrio or Chromobactierum. I found an article showing that Chromobactierum colonies dont have to be purple and can have a range of morphologies (see link). My question is: upon replating, can the morphology of the two colonies change so drastically?( assuming I had two different strains of Chromobacterium present)