92 CASEIN. 



The cheese is separated from the rind, cut up into small 

 pieces, and rubbed down with water until a ropy, uniform 

 mass is produced, into which the slaked lime is stirred as 

 quickly as possible, the mass being used as soon as made. 

 It will not only stick glass firmly to glass, but can also be 

 used for fastening metal on glass, porcelain and meerschaum 

 (pipe mounts). 



7. Casein Cement for Metals. 



Levigated quartz sand 10 parts. 



Casein 8 



mixed with sufficient water to make a cream. 



8. Casein and Borax Cement. 



(a) Ten parts of casein and 5 of borax are stirred with 

 water to a thick milk, and used as glue. The mixture may 

 also be used as an adhesive for the labels of wine bottles, 

 since it does not grow mouldy or loosen in damp cellars. 



(6) If the above cement be coated over several times with 

 gallnut extract when dry, it becomes waterproof, owing to the 

 formation of an insoluble compound between the casein and 

 the tannin. 



Very strong waterproof fabrics, similar to those treated 

 with rubber solution, can be obtained by dipping closely- 

 woven cloth in a solution of casein and borax, allowing it 

 to dry, and then dipping it in a solution of gallnuts. 



(c) Borax is boiled in water, and the cold solution is 

 poured over freshly precipitated casein, which it thereby 

 dissolves to a clear, thick and strongly adhesive mass that 

 will keep indefinitely without decomposing. 



This preparation applied to paper, leather, linen or cotton 

 cloth forms a handsome, glossy coating, and on this account 

 it is largely used as a varnish for cardboard boxes or leather 

 fancy goods. 



