Specification :

Titanium dioxide is the most widely used white pigment because of its brightness and very high refractive index ( n = 2.7) , in which it is surpassed only by a few other materials. Approximately 4 million tons of pigmentary TiO2 are consumed annually worldwide. When deposited as a thin film, its refractive index and colour make it an excellent reflective optical coating for dielectric mirrors and some gemstones like " mystic fire topaz" . 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, inks, foods, medicines ( i.e. pills and tablets) as well as most toothpastes. In paint, it is often referred to offhandedly as " the perfect white" , " the whitest white" , or other similar terms. Opacity is improved by optimal sizing of the titanium dioxide particles.