has role barium sulfate Micropaque A metal sulfate with formula BaO<small>₄</small>S. Virtually insoluble in water at room temperature, it is mostly used as a component in oil well drilling fluid it occurs naturally as the mineral barite. Radiobaryt Readi-CAT Radiopaque Pigment White 22 blanc fixe EneMark Macropaque Liquipake Baritop Esophotrast Barotrast Barosperse Enamel White barite sulfuric acid, barium salt (1:1) barium sulfate EntroBar Microtrast EneCat E-Z-Paque barium sulfate BaSO4 inorganic barium salt radioopaque medium metal sulfate barium salt