Luminous Paint

Luminous paint has so many uses that expert and amateur alike are interested in everything new concerning it. Most of these self-lighting colors are made of barium sulphide or calcium sulphide. A luminant which is highly spoken of is made of calcium tungstate. To prepare this, put into a Hessian crucible 30 parts calcium chloride, 30 parts sodium tungstate, and 30 parts sodium chloride, which have been well mixed. Keep it at a red heat for several hours. The heat breaks down the mass, which becomes a vitreous paste. After cooling and breaking up, the mixture is thoroughly washed with water. Fine crystals of calcium tungstate rernain after fhis process. A coating of strong glue is put over the surface, which tt is desired to cover, and the crystals are thickly strewn over the glue, which hardening,holds them flrmly in place. This is said to be by far the most brilliant self-lumlnant extant.