82 — 



II. Oil of Shiraki Seeds 



This oil is obtained by pressing the seeds of the Excoecaria japonica 

 Muell Arg., a tree growing in the North-eastern part of Japan. The 

 kernal which constitutes about 58% of the weight of the seed, contains 

 53.9% of oil and 4.76% of water. On a manufacturing scale, 23.2% of the 

 weight of the seeds can be obtained as oil. 



The oil is faint yellow in color ; on exposure to the sunlight in a thin 

 layer it turns into a sort of hard varnish after a few days. Under the 

 Eleiden test, the oil takes a reddish brown color and gives rise to a small 

 quantity of reddish precipitate. 



The oil is a good drying oil and furnishes a good substitute for 

 linseed oil. 



The physical and chemical constants of Shiraki seed oil are as 

 follows : — 



Specific gravity at 15°C 0.9365 



Solidifying point On cooling to -18°C. the 



oil becomes turbid. 



Acid value 0.51 



Saponification value 197.1 



Iodine value 164.0 



Reichert-Meissl value 0.17 



Hehner value 92.0 



III. Beech-Nut Oil 



The oil is obtained from the seeds of the Fagus sylvatica L. var. 

 Sieboldi, Maxim. The kernel which constitutes about 49% of the nut, 

 contains 39.6% of oil and 7.3% of water. Entire nuts when pressed give 

 10.6% of their weight in oil on a manufacturing scale. 



The cold drawn oil is pale yellow in color and possesses a slight 

 agreeable smell; it is transparent at indoors temperature, and becomes 

 somewhat turbid on cooling. Under the Eleiden test, the oil precipitates 

 after 2 hours' standing a little of a flocculent substance of orange color 

 and the oil turns into a gelatinous mass after 2 days. The oil is semi- 

 drying and is used as a table oil as well as lubricant. 



