Lithopone is also known as Zinc barium white, which is a kind of non-toxic white powder and also a mixture of zinc sulfide and barium sulfate. And the quality of it is higher and the hiding power stronger, when there is more zinc sulfide in it. It is insoluble in water, and it is easy to be decomposed by acid generating hydrogen sulfide, but hydrogen sulfide does not work when coming across alkali. It can turn to be light gray when shined by ultraviolet radiation for 6-7 hours, but it will recover to be white when left in dark place. Besides, it is easy to be oxidized in the air, and it will be metamorphism when it is affected with damp to be solid. The hiding power and the function of pure white are both stronger than zinc oxide, and the index of refraction and opagueness of it are both superior to zinc oxide and lead oxide, but inferior to titanium dioxide.