504 ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



NAPHTHYLAMINE COLORS FOR PRINTING ON FABRICS. 



A mixture having the properties of aniline black, which is 

 said to produce fast colors, and is adapted to printing on 

 fabrics, may be obtained by adding an oxidizing agent, as 

 chlorate of potash, a copper salt, or hydrofluosilicic acid to a 

 naphthylamine salt, such as the nitrate, acetate, or chloride. 

 The fabric printed with it must be exposed to the air for 

 some time, then be passed through a bath of bichromate of 

 potash, to which sulphuric or nitric acid has been added, and 

 finally, if a beautiful brown or brownish-violet is desired, 

 must be dipped in a solution of an alkaline chloride. The 

 colors produced are said to be permanent. 5 C, 1873, xlii., 

 330. 



CHOCOLATE COLOR ON WOOLEN GARMENTS. 



Boil ten pounds of the goods, for an hour, with one half of 

 a pound of alum, one half of a pound of tartar, and five ounces 

 of chromate of potash; allow them to cool in the bath, and 

 dye by boiling, for half an hour, in a fresh bath of fustic, 

 Brazil-wood, and logwood, according to the shade desired. 

 24(7,1874, x., 73. - 



DARK GREEN ON HALF-WOOL GARMENTS. 



For a garment of two pounds, dye the wool by boiling 

 with one half of a pound of alum, and as much indigo-carmine 

 and fustic decoction as may be needed ; then rinse, and gall 

 overnight with one half of a pound of sumac, and finish dye- 

 ing in a fresh bath, with addition of solution of methyl green. 

 If the shade is not yellow enough, use a little fustic or quer- 

 citron in the green bath. 24 (7, 1874, x., 73. 



aniline blue on w^ool. 



Add to the water in the kettle half a pound of solid chlo- 

 ride of tin, and carefully remove the scum that forms; then, 

 for 20 pounds of cloth or yarn, add 2 pounds of sulphuric 

 acid, 1 pound of sulphate of alumina, and another - 1 pound 

 of chloride of tin, and work the goods in this bath a quar- 

 ter of an hour at boiling temperature ; then add to the boil- 

 ing bath 3 to 4 ounces of aniline blue, soluble in alcohol, in 

 solution, prepared by carefully bringing to boiling heat 1 



