Light brown powder with a slight pink tinge. It has a spicy and astringent taste. As a commodity, there are also those that are prepared into an aqueous solution and then used to prevent corrosion with sulfur dioxide. The surface tension of 0.1% solution is 3.58Pa (pH 3.0~7.0) or 3.82Pa (pH 9.0) Chemicalbook. Strong heat resistance, heated in pH 3~7 aqueous solution, will not change color or change. Strong foaming and the formation of fine, long-lasting foam. Soluble in water, ethanol and dilute ethanol, insoluble in propylene glycol and grease. The pH value of 1% aqueous solution is 4.5~5.5.