" inorganic pigments such as zinc oxide, titanium oxide, calcium carbonate, silic acid, silicate, clay, talc, mica, calcined clay, aluminum hydroxide, barium sulfate, lithopone, silica, colloidal silica and the like; plastic pigments, processed into the form of a sphere, hollow shape, or other various forms and structures, of polystyrene, polyethylene, polypropylene, epoxy resins, acrylic resins, a" . . . . .