Titanium dioxide (TiO2) is the most widely used white pigment because of its brightness and very high refractive index.
The most important application areas of TiO2 are paints and varnishes as well as paper and plastics. Other pigment applications are printing inks, fibers, rubber, and cosmetic products.
TiO2 is also an effective opacifier in powder form, where it is employed as a pigment to provide whiteness and opacity to products such as paints, coatings, plastics, papers, and inks. In paint, it is often referred to as "the perfect white", "the whitest white", or other similar terms. Opacity is improved by optimal sizing of the titanium dioxide particles.