100 CASEIN. 



be provided within the material. Wall coverings of this 

 kind may be decorated in any suitable way on the outer 

 face. 



IMITATION LINOLEUM. 



Albumen, 50 to 80 parts ; casein, 50 ; ground cork or 

 leather scraps, 20 to 40 ; flowers of sulphur, 2 to 4 ; and 

 caustic soda lye, 15 to 16 parts, are intimately mixed to- 

 gether, and the mass can be rolled into strips. The main 

 components are alkali albuminate and alkali caseate. 



IMITATION LEATHER. 



Imitation leather may be prepared with casein by prepar- 

 ing a felted mass of vegetable fibres and animal wool ; and 

 this felt is impregnated with a mixture of linseed oil, resin, 

 turpentine, wax, glycerine, glue and casein, together with 

 small quantities of borax and potassium bichromate, the 

 liquid having been gently warmed before use. After im- 

 pregnation the felt is partly dried, and is then treated with 

 a solution of aluminium acetate, followed by completing 

 the drying process, cleaning and pressing between warm 

 rollers. The product will be a very good imitation of leather. 



IMITATION BONE. 



Clean, white bones or bone chippings are finely ground 

 and mixed to a stiff pulp with casein solution, which is then 

 dried in iron moulds at 130 to 140 F. The mass is next 

 roughly ground, moistened and dried under heavy pressure 

 and at a high temperature in moulds. Steam presses are 

 used, the size and working pressure varying with the di- 

 mensions of the plates to be produced ; and two men are 

 required, one to look after the engine, the other in charge of 

 the press. The metal moulds in which the plates are formed 

 are heated in the press by means of the bed and pressing 

 head, which are traversed by channels containing gas jets. 



