Titanium dioxide is the most widely used white pigment because of its brightness and very high refractive index (n = 2.7), Ti02 is also an effective opacifier in powder form, where it is employed as a pigment to provide whiteness and opacityto products such as paints, coatings, plastics, papers, inks, foods, medicines Cl.e. pills and tablets) as well as most toothpastes.