Ferric Ammonium Ferrocyanide (CI 77510)
What is Ferric Ammonium Ferrocyanide (CI 77510)?
Ferric Ammonium Ferrocyanide, also known as CI 77510 or Iron Blue, is a synthetic inorganic pigment used in cosmetics for its intense blue color. It is prized for its stability, lightfastness, and resistance to fading, making it suitable for long-wear products like eyeliners, mascaras, and nail polishes. The pigment is produced through a precipitation reaction involving iron salts and ferrocyanide, resulting in a fine, insoluble powder that adheres well to skin and hair.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Colorant
Provides or corrects color using dyes or pigments, helping achieve a consistent shade and visual appearance across batches and throughout wear.
Opacifying agent
Makes a formula less transparent to create a creamy, opaque look; can also help visually mask suspended particles and improve aesthetic uniformity.