94 CASEIN. 



CASEIN AND LIME CEMENT. 



The rind is removed from old, skim-milk cheese, and the 

 mass is rubbed with water and warmed until it furnishes a 

 viscid mass like turpentine. This mixture is next incorpor- 

 ated to a plastic mass with a sufficient amount of powdered, 

 slaked lime, in a warm mortar. An alternative method is 

 to take skim-milk curd, press out the whey, and mix the 

 rest with lime as in the other case. The cement must be 

 used at once as it soon hardens. The curd will not take up 

 more than one-fourth its own weight of lime. If larger 

 quantities are needed, a little fine sand or brickdust, previ- 

 ously made up into a paste with the lime and a little water, 

 may be used to replace part of the curd. When the] cement 

 is to be used in very fine joints, it is preferable to use a 

 solution of carbonate of potash as the solvent, and evaporate 

 any superfluous water, or to mix the fresh curd with the 

 same salt. This cement is highly suitable for mending glass 

 or porcelain. 



" PITCH BARM." 



This is a cement capable of numerous applications, and 

 is made by mixing fresh curd with water-glass and powdered 

 caustic lime. The curd must be well pressed to expel the 

 water and is then incorporated with the water-glass, the lime 

 being stirred in so as to form a paste just before use. It 

 hardens quickly. 



CASEIN STOPPING. 



This is used for stopping cracks and joints in wood, stone 

 and brickwork, and is prepared by mixing 1 parts of water- 

 soluble casein, 8 of levigated chalk, 2 of calcined magnesia 

 and 2 parts of fine sawdust. Just before use the mass is 

 stirred to a pulp with water. It penetrates the cracks, 



hardens quickly, smoothens nicely and does not shrink. 



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