Indigo Carmine is a high-purity synthetic dye that produces a deep, royal blue with a slightly purplish undertone. Also known as FD&C Blue 2, it is a classic and widely approved water-soluble colorant. It is a reliable choice for achieving deep blue shades in food products like confectionery and baked goods. Its main technical consideration is its limited stability to heat and light, which makes it best suited for products with a protected shelf life.
