520 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



enough to make a concentrated bath, and the dried wool is 

 to be introduced and colored for an hour at a temperature 

 of 133 Fahrenheit. After this is done the wool is to be 

 transferred to a fresh bath, feebly acidulated, and left for a 

 quarter of an hour. If the shade be yellowish, a little picric 

 acid should be added to this acidulated bath. 23 C, Septem- 

 ber 1,1811, xvn., 239. 



OXIDIZED ANILINE BLACK. 



In the Dyers' Gazette a receipt is given for an oxidized 

 aniline black, of which several advantages are enumerated. 

 The preparation is as follows: Take 309 grains of chlorate of 

 potash, 463 grains of sulphate of copper, 247 grains of chlo- 

 ride of ammonium, and 617 grains of muriate of aniline, and 

 dissolve these ingredients in two wine pints of water. This 

 solution is to be heated to about 140 Fahr. in a water bath, 

 and then removed. After from two to three minutes it com- 

 mences swelling, and is apt to work over the edge of the 

 vessel, at the same time emitting a vapor very injurious to 

 respiration. If, after some hours, the pasty mass be not yet 

 entirely black, it is again to be heated to 140 Fahr. with 

 renewed precautions against its exhalations. Then for one 

 or two days it is to be exposed to the open air, and thorough- 

 ly washed upon the filter. With about fifty per cent, of 

 moisture it forms a paste of oxidized aniline black, which 

 may immediately be used for printing, after being thickened 

 with a considerable quantity of albumen. "When perfectly 

 dry this preparation appears as an intensely black, impalpa- 

 ble powder, without any lustre, which, with more or less gum, 

 may serve as India ink, and even surpasses the genuine 

 Chinese article in quality, as it certainly does in cheapness. 

 Mixed with desiccating oils, it will be useful for painting, 

 stamping, and marking linen. 18 C, 1871,xviil, 288. 



ALBUMEN FROM FISH EGGS. 



The great demand for albumen for manufacturing purposes 

 lias led to the attempt to obtain it from every imaginable 

 source, hens' eggs being of course the most simple, but at 

 the same time the most expensive, and entirely insufficient 

 to afford a supply. An experiment has recently been made 

 by Dr. Grune to utilize fish roes for this purpose, these being 



