Iron Oxide is what gives our makeup its colour, without it you just have a lotion. Our Iron Oxides are put through stringent processes to purify them: we believe that purified iron oxides are the safest non toxic FDA-approved colorant for makeup.Iron oxides are known to be gentle and aren’t known to be allergenic.Our iron oxides are not nanoparticle or micronized in size to ensure they don't cross the epidermis barrier.We do not use dyes or synthetic colours in any of our products we always use natural clays & Iron Oxides.