PAINT OILS AND TIIINNERS 



TABLE III 

 SOYA BEAN OIL AND LEAD DRIER 



SOYA BEAN OIL AND MANGANESE DRIER 



SOYA BEAN OIL, MANGANESE AND LEAD DRIER 



Tung Oil. There are grown in China and Japan many 

 varieties of the " aleurites cordata," popularly known as the 

 tung tree. This tree bears great quantities of large sized nuts 

 containing as high as 40% of an oil which yields itself in a vis- 

 cous yellow form upon heating and crushing of the fruit. The 

 raw oil, which chemically consists of the glycerides of oleic, oleo- 

 margaric, and probably isomeric acids, is distinguished by its 

 rapid drying properties. When spread in a thin layer it pro- 

 duces a hard film with an opaque frosted surface, often showing 

 a tendency to wrinkle. Treated tung oil will dry to a clear, 

 water-shedding, elastic film. This oil is made by heating the raw 

 tung oil at a comparatively low temperature with other oils and 

 a metallic drier such as litharge. 



The affinity of tung oil for rosin has resulted in the production 

 of a series of moderate-priced varnishes most suitable for use in 



N*-. CH 



U] 



