1, ellagic acid is a kind of tannin obtained from five times the seeds. It is yellow or light brown light non-crystalline powder or scale; odorless, slightly special flavor, taste extremely astringent.

2, its aqueous solution and iron salt solution meet blue-black, plus sodium sulfite can delay the discoloration. In industry, ellagic acid is used in large quantities in leather tanning and the manufacture of blue ink. Ellagic acid can make protein coagulation.

3, solubility: soluble in water and ethanol. Almost insoluble in ether, benzene, chloroform and petroleum ether, ellagic acid contains four phenolic hydroxyl groups, has a weak acidity, can be dissolved in alkaline aqueous solution and benzene, ethyl acetate and other organic solvents.