USES OF CASEIN IN THE TEXTILE INDUSTRY. 119 



to a coarse, uniform powder, between rollers running in 

 opposite directions. This powder is mixed with a solution 

 of 1 part of sodium tungstate, and again put through the 

 rollers in order to crush the particles of curd as fine as pos- 

 sible. As soon as the solution is brought in contact with 

 the perfectly dry curd, the reaction commences at once and 

 the mass begins to grow tougher. Should the curd contain 

 much buttermilk, it is stirred up with a little hydrochloric- 

 acid and water, and repeatedly washed with water until all 

 trace of acidity has disappeared. This done, the curd is 

 pressed again and used as above described. 



The cold mixture containing the sodium tungstate is 

 placed in a water-jacketed pan, mixed with a little water if 

 too dry, and melted at a moderate temperature with con- 

 stant stirring, until a sample no longer shows any undecom- 

 posed curd. The mass may be preserved from putrefaction 

 by adding a little carbolic acid or oil of cloves. When the 

 mass is all melted, it may be poured out to cool, and then 

 furnishes a more or less solid mass, according to the amount 

 of water that has been added. 



Owing to its solubility in water in all proportions, the 

 mass possesses highly adhesive properties, and is particularly 

 useful for fastening paper labels on sheet metal. When 

 once dry, it is fairly waterproof. Curtains printed with 

 earthy or metallic colours and this preparation have a fine 

 gloss, and the coating is rendered more flexible by the addi- 

 tion of glycerine. " Glutin " is also soluble in glycerine, and 

 forms therewith a fine, tough mass which, when applied to 

 paper, gives a flexible coating that can be made as hard as 

 leather by passing it through a solution of alum after drying. 



CASEIN DRESSING FOR LINEN AND COTTON FABRICS. 



Four parts of casein are stirred with 30 of water, fol- 

 I6wed by a gradual addition of 1 part of lime that has been 



