490 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



tion of this new product are as yet unknown. Manuf. Re- 

 ^^ew?, VIII., 18. 



PROHIBITION OF ARTIFICIAL ALIZARINE IN RUSSIA. 



By a recently issued Imperial Ukase, the importation of 

 artificial alizarine into the Russian Empire is prohibited. 

 The purpose of this prohibition is said to be the protection 

 of the cultivators of the Russian madder (marena), who for 

 the last twenty years have been extensively engaged in its 

 culture in the province of Daghestan. A few years ago the 

 value of the crop was estimated to have an annual value of 

 three millions of rubles, but it has now greatly fallen oif. 

 The aniline colors are, curiously enough, included under the 

 prohibition with the single exception of crystallized ma- 

 genta which is the one most extensively contaminated 

 Avith arsenic. Manuf. Hevieio, VIII., IS. 



GOLDEN-OLIVE ON CLOTH. 



For two pieces of cloth sixty-one pounds dissolve four 

 pounds of alum and two pounds of purified argol in a de- 

 coction of thirty pounds of fustic ; add four pounds of tur- 

 meric and two pounds of orchil, turn the fabric in, boil for 

 an hour, and then bring to the desired shade with sulphate 

 of indigo, and further boiling. 23 C, August 27, IS15, 631. 



DYEING SILK. 



The following processes are recommended by Reimann's 

 Fdrber-Zeitung for dyeing silk. First remove the gum, ex- 

 cept from tram, best by moving the silk about, suspended on 

 sticks, in a bath heated to boiling, containing one quarter of 

 a pound of soap for each pound of silk; allow it to remain in 

 this for twenty minutes, and repeat the operation in a bath 

 containing one fifth of a pound of soap for each pound of 

 silk. Tram must retain its gum, in order that the fabrics 

 made with it may have the necessary stiflTness and body ; to 

 prepare it for dyeing, place it, until its yellow color disap- 

 pears, in a bath, at a temperature of 212, prepared by mix- 

 ing equal parts of sulphuric, hydrochloric, and nitric acids, 

 and adding water enough to bring it up to 30 Baume. 

 For light shades then wash and bleach it ; for dark shades 

 the bleaching is unnecessary. Treat subsequently in the 



I 



