M. TECHNOLOGY. 581 



dants of acetate of alumina, soap, and oil. Dr. Reimanu, 

 however, directs attention to the peculiar power possessed 

 by starch of abstracting aniline colors from solutions, this 

 not being due to the gluten it contains, since this proper- 

 ty is shared equally by wheat and potato starch ; and he 

 founds upon this a beautiful method for fixing aniline colors 

 on cotton. It is immaterial whether the color is attracted 

 by the starch suspended in the liquid or attached to the fibre. 

 If the cotton is saturated with a thin paste of potato or 

 wheat starch, and then steeped in a dye-bath of aniline color, 

 it will receive the corresponding shade. 24 6^, 1873, viii., 60. 



ANILINE GREEN WITH STRAW. 



Strawy in a manufactured or unmanufactured condition, 

 immortelles, grasses, etc., may be very easily colored with 

 iodine green, as follows : Place the articles in boiling water 

 for from ten to fifteen minutes, and allow the whole to cool ; in 

 the mean time mix together ten quarts of water and 450 grains 

 of chloride of lime, and add 450 grains of crystallized carbon- 

 ate of soda, and then immerse the straw half an hour in the 

 clear liquid obtained by allowing it to settle. Move about 

 the articles thus bleached in a bath of 450 grains of hydro- 

 chloric acid in ten quarts of water for from five to ten min- 

 utes, and color the well-rinsed straw by agitating it in a bath 

 of a clear solution of iodine green, at about 100, in a wood- 

 en vessel, adding a little picric acid for dyeing yellow. 13 

 C\ March 15, 1873, 403. 



BEAUTIFUL BROWN FOR WOOLEN. 



According to the Cluster- Zeitung^ the following method 

 afibrds the most serviceable browm for woolen and half-wool- 

 en goods : After dry removal of all spots with hard soap (for 

 tar stains, butter and soap may be used), the pieces are wash- 

 ed well by hand, and then drawn through a weak, lukewarm 

 soda-bath, rinsed, and passed through a warm acid-bath. 

 For a 20-pound dyeing-bath, 1 pound of Roman alum, 8 ounces 

 of sulphuric acid, and 4 to 8 pounds of archil are boiled for 

 forty minutes, and the shade regulated with turmeric, sulphate 

 of indigo, and archil. For yellowish brown, add 1 pound of 

 common alum, 8 ounces of sulphuric acid, 2 pounds of tur- 

 meric, 4 to 6 pounds of archil, and some sulphate of indigo. 



