BLUE Synthetic food color dyes with CI Number 42090 & CAS Number 3844-45-9 Used in: processed foods, medications, dietary supplements, and cosmetics. adds a distinctive, bright blue hue to confections, beverages, cereals, frozen dairy desserts, popsicles, cakes and cupcakes, chewing gum, frostings and icings. Extensively used as a water tracer agent Brilliant Blue FCF is often found in cotton candy, ice cream, canned processed peas, packet soups, bottled food colorings, icings, ice pops, blueberry flavored products, children's medications, dairy products, sweets soft drinks, and drinks, especially the liqueur Blue Curaao. It is also used in soaps, shampoos, mouthwash and other hygiene and cosmetics applications.