M. TECHNOLOGY. 525 



cording to its character, in a weak bath of o\ to H\ lbs. of 

 chloride of lime to 26^ gallons of water, and, after being wash- 

 ed, is boiled from two to four hours in a bath of 23 ozs. of soda 

 to 26-| gallons of water. If the fibres are very firm the mate- 

 rial is dipped, previous to boiling in the alkaline bath, in a 

 bath containing 6^ lbs. of sulphuric acid, and then allowed to 

 drain well. After treatment in the soda bath the stuff is 

 washed, and immersed from four to six hours in a warm or 

 cold bath of 5|- to 7|- lbs. of chloride of lime and 24- ozs. of 

 soda to 26^- gallons of water, and then washed. Another 

 process consists in employing a chlorine bath, containing ex- 

 cess of alkali, prepared by the incomplete saturation of lye 

 with chlorine, or by the decomposition of chloride of lime 

 by excess of alkaline carbonate. For linen, hemp, and cotton 

 the excess of alkali should be 5 per cent. ; for jute and other 

 substances that are difficult to bleach, 25 per cent., varying 

 with the temperature, which should not exceed 122, the 

 lower temperatures requiring more alkali. 26 (7, XIII., 123. 



REMOVAL OF STAINS OF NITRIC ACID FROM WOOLEN GOODS 



AND THE FINGERS. 



The yellow stains made on brown or black woolen goods 

 by nitric acid can be removed, when freshly formed, by 

 moistening them repeatedly with a concentrated solution of 

 permanganate of potash, and then rinsing with water. Yel- 

 low stains on the hands may be treated in the same way, 

 and the dark- brown coloration produced may then be re- 

 moved by treating with aqueous solution of sulphurous acid. 

 5 C, LI., 1874, 408. 



CHROME-YELLOW, OR GREEN UPON INDIGO GROUND, ON COTTON. 



The Muster- Zeitung recommends the following : Add 2.2 

 lbs. of sulphate of lead to 21 pints of water, and slake in it 

 6.6 lbs. of quicklime, and stir it well into 53 gallons of water, 

 and allow it to clear. Mordant twice in the clear liquid, 

 allow the stuff to drain, and, after half an hour, dye yellow 

 in chromate of potash. 25 C, XIX., 1875, 150. 



DYEING FEATHERS GREEN. 



A German journal recommends a bath prepared by adding 

 to a decoction of turmeric, indigo-blue, and slaked lime ac- 



