Product Name: Lotus brand alum Brand: Green of Category: Water Treatment Compound Color: White powder product features twelve hydrated aluminum potassium sulfate (Alum), also known as: alum, alum, containing water of crystallization of potassium sulfate and aluminum sulfate double salt. Colorless cubic crystal, the appearance often has octahedron, or cube, rhombic dodecahedron form poly shape, sometimes to the {111} plane attached to the vessel wall and hexagonal plate-like shape, are α type Alum class complex salt, glass luster. Density 1.757g / cm3, a melting point of 92.5 ℃. Loss of 64.5 ℃ when nine molecular crystal water, losing 12 molecules of water of crystallization at 200 ℃, soluble in water, insoluble in ethanol. Alum of taste sour, cold, toxic. Therefore, antibacterial, astringent, etc., can be used as medicine. Alum can be used for the preparation of aluminum, baking powder, paint, tanning, clarifying agent, mordant, paper, waterproof agent.