This product is refined from the raw material of high-grade pine and high-grade wood chips in a scientific formula with a special process that combines physical and chemical methods, black and powdery, bacteria-free, scentless, nontoxic, featuring low impurity content, excellent absorptive effect quick infiltration. It can selectively absorb micro-molecule pigments in mono sodium glutamate, citric acid, food additives, glucin and drinks, an-dis widely used to the discoloration, deodorization of food raw materials, additives and other intermediates, the refinement of finished goods, the discoloration and deodorization of medical intermediates, produces specific effect on the discoloration of glutamate acid