Titanium dioxide is an achromatic, inorganic colorant with a very high refractive index. It has an exceptionally high reflectance and displays little or no absorption in the wavelength range of visible light. More than 90% of standardized color palettes contain TiO2 pigment due to its superior hiding power. TiO2 pigments are non-toxic and easy to disperse. It is resistant to high temperatures, as well as prevailing atmospheric influences. TiO2 pigments are insoluble in water, organic solvents, alkalis, and most inorganic acids. There are no adequate substitutes for TiO2 pigments in most applications.