Pearl pigment is widely used in the cosmetics, plastics, ink, leatheroid, leather, wallpaper, porcelain enamel and pottery, building paint and other industries. The main types of pearl pigments are: natural scale pearl pigment, bismuth oxychloride, crystal pearl pigment, mica covered pearl pigment, Mica covered pearl pigment is applied at large now. Covering the mica with titanium oxide, or ferric oxide or other metallic oxide produces them. The range of mica is from 2µm to 700µm, and the depth is 0.5µm. The mica coated by metallic oxide is very velvet, so it has very nicer light reflecting and clarity clarity capability, which means that only part of light is reflected, and the transmission light penetrate the mica, reach another floor and can continue to be reflected, so form many reflection in many floors. Therefore we can see a kind of twinkling luster which is wonderful and deeply, and we call it “pearl luster”. The pearl luster will be different with the change of particle.