230 DAIRY TECHNOLOGY 



for waterproofing cloth and for loading silk (making it 

 appear heavier than it really is). 



Casein Foodstuffs. — The importance of proteids in 

 the food of man is generally recognized. This essential is 

 usually furnished to a large extent in the form of meat, 

 but the proteids of milk may form a very satisfactory 

 substitute for meat, and there are on the market for this 

 purpose a number of casein products. Lactarine, Sanato- 

 gen and Galactogen are made up mostly of casein. Eulac- 

 tol is an evaporated milk similar to our common milk 

 powder. Plasmon, Nutrium, etc., are products consisting 

 of casein, milk sugar, and salts. 



Casein in the Paper Industry. — " An important part 

 is played by the adhesives in the industries wherein paper 

 is employed, both in order to inseparably fasten together 

 individual sheets of paper, convert paper pulp into a mould- 

 able condition, and also for the application of thin layers 

 of colouring matter or other coatings may be either mat or 

 more or less glossy, but in any event must be able to with- 

 stand to a certain extent the influence of moisture. For all 

 these purposes casein is admirably adapted, since it will 

 stick sheets or bands of paper together and forms thin 

 coatings of considerable elasticity both alone or in associa- 

 tion with other substances, colouring matters in particular. 

 When a solution of casein is treated with small quantities 

 of formaldehyde, and the article coated with the prepara- 

 tion exposed to the air, a number of new products can be 

 obtained. Thus, for instance (by patented processes), we 

 obtain waterproof cardboard boxes and cartridge cases, 

 washable wall papers, washable paper garments, coloured 

 papers, art papers, transfer papers and so on. Utensils, 

 more particularly basins, dishes and the like, made of paper 

 pulp or millboard, can be rendered waterproof by treat- 

 ment with formaldehyde, and used for a variety of purposes, 

 e.g., as developing dishes in photography. Similarly, card- 

 board treated in the same way can be used for stereo- 



