... harmful pigment, aflatoxin, phosphatide, saponin, colloid, cotton acid from oil to make it high-grade edible oil.♦Decolorization ... vegetable oil for industrial purpose.♦In petroleum industry, acid activated bleaching earth is used for decolorization,refinement,purification ... wax, white oil, lubricating oil,Vaseline,etc.).♦Recycling and regeneration of industrial waste oil (mineral oil like machine oil ...