64 CASEIN. 



solvent action on the lake. The method is particularly 

 useful for precipitating rhodamines and eosines, which it 

 converts into extremely brilliant fine red lakes that are 

 non -poisonous. The casein lakes also merit attention for 

 coloured bookwork and litho printing, and for wall paper 

 and calico printing. 



PAINT FOR MARKING BAGS, IRON BARRELS, CASES, ETC. 



A good paint which will stick on fabrics, paper, wood, 

 sheet-iron, etc., and is therefore suitable for marking and 

 stencilling cases, wrappering, jute sacks, etc., is prepared in 

 the following manner : 



About 20 parts by weight of water are heated to boiling 

 in a glass vessel, and 1 part of aniline dye is stirred in, 

 eosine being used for red, and phenol black or deep black for 

 black. When this is dissolved, 2 parts of soluble casein are 

 stirred in. If the liquid seems too thick when cold, and 

 therefore difficult to lay on with the brush, it must be diluted 

 with a corresponding amount of hot water. 



The aniline dyes may be replaced by logwood solution ; 

 but tincture of gall-nuts is not suitable for this purpose. 



Stencilling paste is made by mixing pipeclay with ivory 

 black or lampblack. The pipeclay (kaolin) is suitably 

 coloured with aniline dye, carefully incorporated with the 

 ivory black or lampblack, and then introduced into a thin 

 solution of casein. After being put through a paint mill, 

 the mass is packed in tin boxes. 



CASEIN-CEMENT PAINT. 



Hausler recommended English Roman cement for this 

 purpose: If the boards to be coated are left unplaned, and 

 pillars and beams are gone over with the roughing plane, 

 the following method is recommended ; and the wood will 



