Warm boost is Erika’s favorite red corrector for preventing blue/ grey undertones. This is one of Aesthetic Artistry’s SUPER CONCENTRATES pigment choices. Classified as an inorganic formula. Used to warm up any KremaKroma pigment. Contains 50% Iron Oxide Orange and 50% Iron Oxide Red. Can also be used on eyeliner or brows to change the undertone from cool to neutral, or from neutral to warm. Also used to mix with any brow color to add warmth for red hair customers. 10ml