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what is the alum powder?

Colorless crystallization, the white particles, or crystalline powder, piece and piece.Odourless, taste sweet and astringent.At 120 ℃ lost 10 molecular crystal water, into anhydrous product when he was about 250 ℃, 280 ℃ above decomposition.The refractive index of 1.459.Soluble in hot water, acidic aqueous solution.There are strong convergence.