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-Cosmetic ingredients bestowed by nature INTRODUCTION Sericite is a general term for a fine-grained muscovite (K2O・3Al2O3・6SiO2・2H2O) with silky luster. Since sericite usually contains titanium oxide in its components of muscovite, it exhibits the qualities of either muscovite or illite, or both of them. The following tables show main components of minerals and sericites of different origins. Their composition is almost the same, broadly classified into two categories: clay minerals (such as quartz and sericite) and crystalline schist. Their original minerals, however, contained such impurities as ferric sulfide, mispickel, galena, etc.
Putrilages of animals and plants were deposited in old veins of sericite blown up by hot water several millions years ago, and they turned into humus soil because of enzymatic action by bacteria and microbes. Such humus soil is generally bond strongly with clay minerals, and it may exist in minerals as impurities.
Eight-Pearl ® 300S Eight-Pearl ® 300S is purified sericite powder for a cosmetic ingredient. Sericite is dispersed in an alkaline solution to elute humus soil, and then treated by acid to remove insoluble organisms and microbes. Table 3: Contents of Eight-Pearl ® 300S
Eight-Pearl ® 300S is purified by removing or minimizing the contents of iron oxide, calcium, and magnesium that may be a cause of color change and slipping problem when they are contained in cosmetics (see table 3). Besides, ferric sulfide with a distinctive odor may obstruct cosmetic siliconisation or complex compounding. It is also minimized more than counter products. Pure sericite fine powder of Eight-Pearl ® 300S offers moderate luster and transparency as well as contributing to skin protection by improving extensibility and adhesive property, and by preventing oxidation caused by secretion such as sweat and sebum.
Eight-Pearl ® FK-1000 Eight-Pearl ® FK-1000 consists of calcined fine powders of Eight-Pearl ® 300S. A slight residue of ferric sulfide is completely oxidized, decomposed, and removed. By discharging crystal water, Eight-Pearl ® FK-1000 is completely dehydrated and stabilized without crystal lattice distortion. Besides, silicate is not crystallized but forms a ceramic layer with alkali. Eight-Pearl ® FK-1000 is an odorless, stable, and top-quality cosmetic ingredient. Photo 3: Macro photography of Eight-Pearl ® FK-1000
Eight-Pearl ® 300S-2S Eight-Pearl ® 300S-2S consists of silicone coated fine powders of Eight-Pearl ® 300S. Powders are coated with methylhydrogenpolysiloxane by which smoothness, water resistance, and affinity to skin are greatly improved. Eight-Pearl ® FK-1000-2S Eight-Pearl ® FK-1000-2S consists of silicone coated fine powders of Eight-Pearl ® FK-1000. Powders are coated with methylhydrogenpolysiloxane by which smoothness, water resistance, and affinity to skin are greatly improved. 
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