The pink color which shows that the results came out as negative which means that the bacteria did not ferment carbohydrates.
Carbohydrate fermentation is the process microorganisms which is used to produce energy that most of microorganisms which converts glucose to pyruvate during glycolysis. The medium may contain various color that indicates to detect the production of acid from fermentation a Durham tube is placed in each tube to capture gas produced by metabolism.
Red broth is general purpose that differential test ,medium typically used to differentiate gram negative enteric bacteria. It indicate that there is a drop in pH because of the production of acid by the fermentation of carbohydrate present in the media.
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