88 CASEIN. 



used to replace gum-arabic in all cases where dextrin would 

 be unsuitable. 



CASEIN FOR MENDING GLASS, CHINA, ETC. 



Take one quart of milk and stir into it 120 grains tartaric 

 acid, gently heating until it coagulates. 



Drain off the casein and dissolve it in a 6 per cent, warmed 

 borax solution, i.e., just sufficient to liquefy. 



SOLID CASEIN ADHESIVE. 



The mass, consisting of a mixture of alkali tannate, 

 casein and water, is said to possess good adhesive pro- 

 perties. In the dried state it forms a somewhat hard and 

 rather elastic mass, which is insoluble in water and various 

 other liquids. It is prepared by pouring a cold or warm 

 solution of tannic acid (bark extract) into a solution of milk 

 of lime until precipitation ceases and the filtrate has an 

 alkaline reaction. The precipitate is separated, and is dried 

 at the ordinary temperature in a current of air. This cal- 

 cium tannate is powdered and mixed with lime, unless an 

 excess of this base is present already, the whole being next 

 ground along with casein powder, sifted and stirred up with 

 a sufficient quantity of water. According to the desired 

 character and properties of the finished product, from 1 to 10 

 parts of casein are taken to each part of tannate. Casein is 

 not precipitated on adding water, but the mixture forms a 

 strongly adhesive mucilage which, when dry, becomes hard, 

 tough, elastic and insoluble in water, petroleum, carbon 

 disulphide and other liquids. 



CASEIN GLUE FOR CARDBOARD BOXES. 



Forty-five parts of dry casein powder are dissolved by 

 degrees in 32 parts of water by continued stirring, | part of 

 borax and rather more than part of strong ammonia being 

 added to the mixture, which is next warmed up to near 



