Phenol Red Salicin Broth is used for salicin fermentation studies of microorganisms.to determine the fermentation reaction of carbohydrates for the differentiation of microorganisms, with various carbohydrates serves as a differential medium by aiding in differentiation of various species and genera by their ability to ferment the specific carbohydrate, with the production of acid or acid and gas. It is used to study salicin fermentation in various bacteria