Ferric Ferrocyanide (CI 77520)
What is Ferric Ferrocyanide (CI 77520)?
Ferric Ferrocyanide (CI 77520) is an inorganic blue pigment used in cosmetics for coloring purposes, particularly in eye makeup, nail polishes, and some skincare products like foundations or tinted moisturizers. It is a stable, lightfast compound derived from iron and ferrocyanide, providing a deep blue hue without being soluble in water or most solvents. This pigment is valued for its non-reactive nature and ability to withstand formulation processes without breaking down.
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.