Ferric Ammonium Ferrocyanide Average Colouring Agent/Pigment No known benefits Ferric Ammonium Ferrocyanide description Inorganic salt of ferric ferrocyanide used as a colouring agent in cosmetics for application to skin and eye area, but not to the lips. Like all cosmetic colouring agents, this one is subject to strict regulations controlling its use. Related ingredients: Ferric Ferrocyanide