 Like other chalcogenides of the alkaline earth metals, BaS is a short wavelength emitter for electronic displays.It is colorless, although like many sulfides, it is commonly obtained in impure colored forms.BaS was prepared by Vincentius (or Vincentinus) Casciarolus (or Casciorolus, 1571-1624) via reduction of BaSO4 (available as the mineral barite).