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| Tannic Acid Gallotannic Acid | Gallotannin | Tannin | Acid, Gallotannic | Acid, Tannic A lustrous powder, yellow to light-brown in color, that is found in tree bark (particularly oak), fruits, leaves, and tea. It is used medicinally as an astringent, commercially in tanning hides, and as a dye mordant. (Saunders Dictionary and Encyclopedia of Laboratory Medicine and Technology, 1984). It is also used as a histological fixative and stain. |