158 LIVING LIGHTS. 



described process with 6 parts prepared barium sulphate, 

 6 parts prepared calcium carbonate, 12 parts prepared white 

 zinc sulphide, and 36 parts good luminous calcium sulphide 

 in a proper vessel, to an emulsion, and then grinding it very 

 fine in a color-mill. For red luminous paint, 60 parts varnish 

 are mixed with 8 parts prepared barium sulphate, 2 parts 

 prepared madder lake, 6 parts prepared realgar (red arsenic 

 sulphide), and 30 parts luminous calcium sulphide, and 

 treated the same as for white paint. For orange luminous 

 paint, 46 parts varnish are mixed with 17.5 parts prepared 

 barium sulphate, 1 part prepared Indian yellow, 1.5 parts 

 prepared madder lake, and 38 parts luminous calcium sul- 

 phide. For yellow luminous paint, 48 parts varnish are mixed 

 with 10 parts prepared barium sulphate, 8 parts barium 

 chromate, and 34 parts luminous calcium sulphide. For 

 green luminous paint, 48 parts varnish are mixed with 10 

 parts prepared barium sulphate, 8 parts chromium oxide 

 green, and 34 parts luminous calcium sulphide. 



A blue luminous paint is prepared from 42 parts varnish, 

 10.2 parts prepared barium sulphate, 6.4 parts ultramarine 

 blue, 5.4 parts cobalt blue, and 46 parts luminous calcium 

 sulphide. 



A violet luminous paint is made from 42 parts varnish, 10.2 

 parts prepared barium sulphate, 2.8 parts ultramarine violet, 

 9 parts cobaltous arsenate, and 36 parts luminous calcium 

 sulphide. 



For gray luminous paint, 45 parts of the varnish are mixed 

 with 6 parts prepared barium sulphate, 6 parts prepared cal- 

 cium carbonate, 0.5 parts ultramarine blue, 6.5 parts gray 

 zinc sulphide. 



A yellowish-brown luminous paint is obtained from 48 parts 



