... acid,pharmaceutical tannic acid,dye grade,food geade,beer-mashing grade,beer brewing grade Physicochemical Properties:It is faint ... odourlessness, astringency. Dissolves in the water, ethyl alcohol, acetone and ethyl acetate. Quality standard:GB5308?5 Technical index:Appearance: ... acid in chemical production, mud finishing agent in oil industry, in addition, used in producing leather tanning agent, ...