Description:Aqueous solution of yellow to dark brown, slightly sweet, gray powdery solid or crystallization, astringency. Soluble in water, ethanol, ethyl acetate, slightly soluble in oils and fats. Are stable to heat, acid, 2% solution is heated to 120 ℃ and 30 min, no obvious change, 30 min in the 160 ℃ oil degradation by 20%, 2% solution in 3 days at 37 ℃, in the pH > 7 easy oxidation polymerization and illumination. 2% tea polyphenol in 2%, 5% and 10% salt solution at pH = 6.5 save 3 days at room temperature, its content has no change. In green black iron complex compound. Slightly damp, water solution pH value of 3 ~ 4, easy oxidative Browning in alkaline conditions.
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