The oldest and formerly most important of the white pigments is white lead, which is so longer permitted as a consistent of most points. Zinc oxide, another white pigment formerly widely used, is now of only minor importance. The kind of white pigments such as follows: Titanium Dioxide Zinc Oxide Lithophone Zinc sulphide Antimony oxide Lithophone Lithophone is a mixed zinc sulphide, barium sulphate pigment that contains about 30% zinc sulphide. The original light sensitiveness has been overcome by raw material purification and by addition of such agents as polythionates and cobalt sulphate. Lithophone is a brilliantly white, extremely fine, cheap, white pigment. It is particularly well adapted to interior coating. The manufacture of this substance, barium, zinc and lithopone circuits are represented by different types of lines. The barium sulphide solution is prepared by reducing barite are (BaSO 4 ) with carbon and leaching the resulting mass. The equation is: BaSO 4