CI 15985

CI 15985, also known as Tartrazine or FD&C Yellow No. 5, is a synthetic azo dye commonly used in cosmetics and pharmaceuticals. It is a water-soluble colorant that imparts a yellow hue to skincare products, ranging from pale to vibrant depending on concentration.In skincare formulations, CI 15985 serves purely a cosmetic purpose—it does not alter the efficacy of active ingredients or provide direct skin benefits. Its role is aesthetic, helping to identify, differentiate, or simply improve the visual appeal of a product.

CI 15985 is a synthetic dye molecule that absorbs and reflects light in the yellow spectrum. When mixed into a skincare formula at low concentrations, it imparts colour without chemically interacting with the skin or other ingredients in most cases.The ingredient remains largely on the surface and in the product itself rather than being absorbed deeply into the skin. Its presence does not meaningfully affect the performance of active skincare ingredients.

CI 15985 requires no special application instructions, as it is simply part of the product formulation. Use the skincare product as directed by the manufacturer. If you have a known sensitivity to azo dyes or artificial colorants, check the ingredient list before purchase.

CI 15985 is approved for use in cosmetics in the UK and EU and is generally well-tolerated. However, some individuals—particularly those with azo dye sensitivity or certain food allergies—may experience irritation or allergic reactions. Discontinue use if redness, itching, or swelling occurs.