USES OF CASEIN IN THE TEXTILE INDUSTRY. 125 



and the zinc white is so firmly fixed on the fibre that it will 

 stand boiling with soap for a quarter of an hour. Finally, it 

 should be noted that the casein colours fixed with formal- 

 dehyde are as pure in tone as those obtained with egg 

 albumen, whilst considerably lower in price. 



W. Kay & Schoen print the cotton fabric with a colour 

 compounded of 3| parts of zinc white and 1 of casein- 

 borax medium ; and the goods are afterwards steamed for 

 five to ten minutes. In the bottom of the steamer is ar- 

 ranged a perforated pipe, through which formaldehyde (40 

 per cent.) is admitted in order that it may be vaporised in 

 the steam chamber and fix the casein and zinc white on the 

 fibre. 



CASEIN-MAGNESIA. 



Ten parts of powdered casein, 40 of water and f part of 

 magnesia are mixed together for twenty-four hours at the 

 ordinary temperature, and afterwards added to a solution 

 of 0*3 part of barium hydroxide in 30 parts of water, the 

 whole being warmed to 95 F. for some time. An excess 

 of barium hydroxide is injurious. This preparation will fix 

 mineral pigments to stand washing. 



CASEIN MEDIUM FOR CALICO PRINTING. 



Six parts of casein are well stirred up with 50 of water 

 at 120 F., and left to settle. The clear liquid is poured off' 

 and the residue is mixed with 1 part of borax dissolved in 

 12 parts of water. 



CHEVALOTT'S WATERPROOFING PROCESS. 



The Chevalott process is designed to deprive textile 

 fibres of their capillarity, and thus prevent them from ab- 

 sorbing water, without obstructing the interstitial spaces 

 between the threads in the fabric. The process is highly 

 suitable for materials that are to be worn next the skin, and 



