148 CASEIN. 



Casein 16 parts by weight. 



Soda crystals .... 6 parts, dissolved in 



Water 48 parts, and mixed with 



Ivory black .... 145 



Dextrose . . . . 75 ,, 



Olive oil 12 



Iron resinate .... 5 ,, 



This should be further mixed with 5 parts of ferric 

 cyanide, dissolved in 1 to 2 parts of oxalic acid and 5 of 

 water, the whole being stirred in a suitable stirrer. For 

 solid polishes, the proportion of solid ingredients is increased. 



CASEIN SHOE CREAM. 



Casein exhibits the property of furnishing with thick tur- 

 pentine a handsome, shining compound, suitable for various 

 purposes, especially shoe polish. For this purpose 4 parts 

 of galipot are melted, strained through a sieve, and boiled with 

 3 parts of water and 2 of caustic soda lye (density, 37 B.) 

 until a film has formed on the surface, whereupon another 

 1 part of the soda lye and 50 to 60 parts of warm water are 

 added ; 15 parts of soda crystals are dissolved in the liquid, 

 and 10 parts of powdered casein are stirred in until dissolved. 

 This is followed by 10 parts of grey carnauba wax, and the 

 whole is boiled until homogeneous. If a cooled sample be 

 found too stiff, a little water is added. An aniline dye that 

 is fast to alkali may be used for colouring. 



CASEIN PHOTOGRAPHIC PLATES. 



With the invention of the silver bromide dry plate, which 

 rendered outdoor photography possible, arose the necessity 

 for replacing the support (the glass plate) by some material 

 which, whilst possessing the transparency of glass, is free 

 from the objectionable properties of fragility, weight and 

 bulk. 



Endeavours have been made to overcome this difficulty in 

 various ways, but though films of celluloid, paper, mica and 



