584 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



again, and for very dark brown they may be placed in a 

 cold bath of acetate of iron, of 2 Baume, before the chrome- 

 bath. 24 (7, 1873, 114, 121. 



ANILINE BLACK WITH TUNGSTATE OF COPPER. 



The following method, according to the Muster- Zeitung, 

 affords a fine aniline black for printing on fabrics; and al- 

 though the high price or other obstacles may prevent its use 

 on a large scale, it has been found to give almost equally 

 satisfactory results, at a less cost, when in combination with 

 other blacks. Tungstate of copper is to be prepared from 

 tungstate of potash and chloride or sulphate of copper, and 

 stirred with starch and water, and while warm a mixture 

 added, composed of 180 grains of chlorate of potash, 120 

 grains of chloride of ammonium, and 600 grains of chloride of 

 aniline. Other tungstates instead of that of copper can be 

 employed, but soluble ones seem most suitable. 25 C\ 1873, 

 107. 



CHINESE W^ATER-PKOOF YARNISII FROM BLOOD. 



Dr. Scherzer, an eminent Austrian naturalist, during a re- 

 cent visit to China, learned the mode of preparing a water- 

 proof varnish very extensively used in that country for coat- 

 ing boxes and other packages which it is desired to protect 

 against moisture. For this purpose four parts of blood, 

 fresh drawn, are mixed in four parts of powdered slaked 

 lime and a small quantity of alum. One, two, or three coats 

 of this mass, which is slightly viscid, will impart so great a 

 degree of impermeability to wood to which it has been ap- 

 plied that it is said to be unnecessary to use the interior 

 tin or lead lining to boxes for transporting delicate articles 

 through the tropics. Owing to its cheapness, it can be used 

 for coating boxes containing sugar, coffee, tea, and other sub- 

 stances. 3 B^ 3Iay 22, 187a, 142. 



QUICK-DRYING OIL COLOR AND YARNISH. 



According to the Muster- Zeitimg^ the following affords an 

 excellent varnish, imparting a beautiful and durable gloss, 

 which is a protection from the action of moisture and of the 

 atmosphere, and also causes oil colors to dry more quickly : 

 Heat twelve parts of shellac and four jDarts of borax, under 



