CI 77510 (Ferric Ferrocyanide / Prussian Blue)

CI 77510 is an inorganic colorant used in cosmetic formulations to provide an intense blue hue and to support precise shade adjustment across a wide range of products. Known as Ferric Ferrocyanide (commonly referred to as Prussian Blue), it delivers strong tinting strength and can help create cooler tones, deepen shades, or neutralize unwanted warmth when blended with other pigments. CI 77510 is frequently used in color cosmetics and decorative formats such as eyeshadows, eyeliners, mascaras, brow products, lip products, foundations, concealers, and powders, and may also be found in certain rinse-off or leave-on items where a blue tone is desired. Typical formulation considerations include dispersion quality, opacity/transparency targets, particle size selection, and compatibility with the chosen base (oil, water, or anhydrous systems), as well as performance factors such as wear, rub-off, and color stability. Recommended use levels and regulatory suitability depend on product type and region, and should be confirmed against applicable cosmetic regulations and supplier specifications.