KeviDiet Indigo Carmine also known as FD&C Blue No. 2 is an organic salt which is derived from indigo by aromatic sulfonation. This synthetic organic class compound is physically appears as a blue colored powdered compound that shows good solubility in water and is commonly used as a colorant within foods, beverages, and medications to give them a blue or greenish-blue hue. KeviDiet Indigo Carmine has a chemical formula of C16H8N2Na2O8S2 with molecular weight of 466.36 grams per mol. It may have negative health effects such as allergic reactions, hyperactivity in children, and potentially carcinogenic properties hence it is advised to use it in calculated amounts.