Mainly used locally, its 1 1%~20% ointment is used for exudative ulcer, scald, bedsore, hemorrhoid, eczema, etc., and its 15%~20% glycerol solution is used for stomatitis, tonsillitis and pharyngolaryngitis, etc., and also used for detoxification. It is effective for dehydrated morphine, acne, eczema, etc. When used for colonography, add 0.25~0.5% of this product to barium sulfate enema to clean colon and facilitate development.
Extended data:
Tannic acid can coagulate protein. People chemically treat pigskin and rawhide with tannic acid, which can solidify the soluble protein in rawhide. As a result, the rawhide that would stink and rot after a few days has become beautiful, clean, flexible and durable leather. This tanning process is called leather tanning.
Yellow or light brown light amorphous powder or scale; No odor, slightly special smell, and extremely astringent taste. Soluble in water and ethanol, soluble in glycerol, almost insoluble in ether, chloroform or benzene. Its aqueous solution turns blue-black when it meets iron salt solution, and adding sodium sulfite can delay the discoloration. In industry, tannic acid is widely used in tanning leather and making blue ink.
Baidu encyclopedia-tannic acid