... tannic acid,pharmaceutical tannic acid,dye grade,food geade,beer-mashing grade,beer brewing grade Physicochemical Properties:It is faint ... Use:It is raw material of preparing medical gallic acid, burnt gallic acid, sulfonamides. Preparing Gallic acid and burnt Gallic acid in chemical ... , dressing inhibitor, wines clarifying agent, germanium extraction and blue-black ink and so on. tannic acid