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Activated clay is an adsorbent made from clay (mainly bentonite) as the raw material. It undergoes inorganic acid treatment, followed by washing with water and drying. It appears as a milky white powder, odorless, tasteless, non-toxic, and has strong adsorption properties. It can adsorb colored substances and organic materials. It tends to absorb moisture in the air, and its adsorption properties may decline over time if it is stored for too long. However, it can be heated to300Above the Celsius temperature, the crystalline water begins to be lost, causing changes in the structure and affecting the fading effect. Activated clay is insoluble in water, organic solvents, and various oils, but it is almost completely soluble in hot caustic soda and hydrochloric acid. Its relative density2．3～2．5, burbles in water and oil.