White or light yellow crystalline powder. Melting point 179-182 ° C. The boiling point is 274-275 ° C. Soluble in methanol, ether, difficult to dissolve in hot water, can be volatilized with water vapor; obtained by oxidation of tannic acid, can be used as an intermediate in medicine, photosensitive materials, pesticides, organic pigments. Mainly used in the manufacture of hemostatic aromatic acids, p-carbonitrile, p-toluoyl chloride, photosensitive materials.
