CathayCoat™ YA21E Yellow Iron Oxide is one of the highest quality Yellow 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 Yellow Iron Oxides, YA21E, has excellent lightfastness, and chemical resistance. In normal applications it is considered a permanent pigment. While Iron Oxide Pigments are the largest volume colored pigment used in the world, Yellow Iron Oxide is the largest group of Iron Oxide Pigments. It is hard to make it through the day and not touch something colored with Yellow Iron Oxide.