Titanium dioxide (chemical formula: TiO2), white solid or powdery amphoteric oxide, molecular weight: 79.83, is a white inorganic pigment with non-toxic, best opacity, optimum whiteness and brightness, considered to be the world today A white pigment with the best performance. Titanium white has strong adhesion, is not easy to change chemically, and is always white. Widely used in coatings, plastics, paper, printing inks, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used to make fire-resistant glass, glaze, concrete, clay, and high temperature resistant experimental vessels. At the same time, titanium dioxide has a good UV masking effect, and is often incorporated into textile fibers as a sunscreen. Ultrafine titanium dioxide powder is also added to sunscreen cream to make sunscreen cosmetics. Titanium dioxide can be extracted from rutile by acid decomposition or from titanium tetrachloride. Titanium dioxide is stable in nature and is used in large quantities as a white pigment in paints. It has good hiding power and is similar to lead white, but it does not turn black like lead white; it has the same durability as zinc white. Titanium dioxide is generally classified into anatase (Anatase) and rutile (Rutile). On October 27, 2017, the World Health Organization's International Agency for Research on Cancer published a preliminary list of carcinogens, titanium dioxide in the list of Class 2B carcinogens.