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Yes, it is possible to decolorize crude palm oil with activated carbon. Activated carbon is a highly porous material with a large surface area, making it effective in adsorbing impurities, including pigments, from liquids. This process is called adsorption, and it involves the physical binding of the impurities to the surface of the activated carbon. While both activated carbon and crude palm oil are solids, the decolorization process occurs through contact between the solid activated carbon and the liquid palm oil, not through direct interaction between the solids.