172 APPENDIX. 



is attained by simply treating the casein with water vapour 

 whereby a decomposition of the casein takes place. The 

 amount of water vapour taken up by the casein depends upon 

 the purity of the casein and can be any quantity. If, for 

 example, one took one part by weight of casein and ten parts 

 by weight of water vapour, one would obtain the same tough 

 mass as when taking one part by weight of casein and two 

 parts by weight of water vapour. The hitherto granular 

 casein bales itself into a hanging-together, indiarubber-like 

 mass from which all the vapour, which has not combined 

 therewith, but has only been mechanically enclosed therein, 

 can be removed. There then remains a soft mass, which in 

 this condition is pressed and produces fairly hard objects which 

 only require a few days wherein to dry. In order to increase 

 the water constancy, the pressed objects are treated with 

 formic aldehyde. 



CASEIN PAINT. 



(German patent 186,272 : A. Brunstein, Hamburg.) Casein, 

 or other albuminate, is mixed to a stiff pulp with quick- 

 lime, chalk and water, a slight current of air being then 

 blown though the mass until it becomes fluid and gives off 

 a faint smell of ammonia. Chlorinated, brominated or iodated 

 oil is next stirred in, and the mixture is either converted 

 into powder by trituration with chalk, or else diluted with 

 water to a workable consistency. The oil is chlorinated 

 by treating it with chlorine water and agitating the mixture 

 until the oil has taken up a large proportion of chlorine. 

 When bromine or iodine is employed, an alcoholic solution is 

 used, the solvent being afterwards expelled. 



WATER- WHITE CASEIN VARNISH. 



(German patent 200,919: M. Fehringer, Fuerth.) When 

 an alcoholic solution of resin is mixed with an ammoniacal 

 solution of casein, the resulting varnish, though drying with 

 a high glass, is always cloudy, the matter in suspension being 

 irremovable by settling or by the use of clarifying agents. 



