CathayCoat™ BA31 Black Iron Oxide is one of the highest quality Black Iron Oxides on the market today. Utilizing premium raw materials processed to exacting specifications, this pigment exhibits easy-dispersing properties and high color strength. Like all Black Iron Oxides, BA31, has excellent lightfastness and chemical resistance. In normal applications it is considered a permanent pigment. While weaker than typical Carbon Black pigments, Black Iron Oxides are more compatible with water base systems. Black Iron Oxides also have the unique property of being magnetic, since they are based on the mineral Magnetite.