528 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



about frequently. It must then be allowed to lie for twelve 

 hours in a dye bath, prepared from a decoction of logwood 

 with lime-water at 122, and then be rinsed and dried. JBlue, 

 inclining to violet: The hair must first be dyed brown, as just 

 given, and then passed through water, to which a little of a 

 solution of 10^ ozs. of tin in 35j ozs. of hydrochloric acid 

 has been added, and then washed as in the previous case. 

 Blue: The hair must be prepared in a solution of two parts 

 of alum and one part of tartar, wrung out, and passed into an 

 indigo bath, prepared with fuming sulphuric acid, and then 

 rinsed and dried. Red: The hair must be prepared by 

 placing it for half an hour in a tin salt bath, prepared like 

 that for violet blue; after wringing it out it must be dyed 

 with Brazil-wood, to which some alum has been added, al- 

 lowing it to remain in the dye-bath for twenty-four hours, 

 and then rinsing and drying it. 5 (7, XL VIII., 1874, 384. 



NEW BLACK PRINTING COLOR. 



According to Knaffl, if vapor of turpentine is passed over 

 sesquioxide of iron (Coleothar vitrioli) at a red-heat, a black 

 pigment results, surpassing printing-ink in softness, lightness, 

 and depth of color, and said to be adapted to printing from 

 stone, copper, and steel. 13 C, November 1, 1874, 1370. 



NEW AND DURABLE COLORS. 



Durable colors can be prepared economically, according 

 to The English Mechanic, by mixing small portions of sul- 

 phate of iron, nitrate of manganese, and nitrate of cobalt or 

 sulphate of copper with a solution of sulphate of zinc. The 

 mixture is then reduced to dryness, and subjected to suffi- 

 cient heat to drive oif the sulphuric acid. The colors pre- 

 pared by this process are yellows, greens, grays, pinks, and 

 gold. 19 A, October 16, 1874, 118. 



IODINE GREEN ON W^OOLEN TARN. 



According to the Deutsche Farber - Zcitnng the mordant 

 for iodine green on woolen yarn is prepared by adding 40 

 lbs. of purified hydrochloric acid and 50 lbs. of hyposul- 

 phite of soda to 225 lbs. of soft water, and allowing it to 

 settle. For 20 lbs. of wool, 40 lbs. of this mordant is heated 

 to 158, and the yarn is well worked in it, with constant 



