THE PREPARATION OF CORN OIL. 



Equally as important as the proportion of earth is the temperature ; 

 hence, experiments were made to determine the proper temperature 

 range at which the oil should be treated. A sample of oil which had 

 previously been dehydrated in the manner described was divided 

 into five lots, each lot to be bleached with 6 per cent of fuller's earth 



65" /0O /SO 200 



Fig. 2. — Relation between the temperature maintained and the extent of the bleaching affected. 



at temperatures of 25°, 65°, 100°, 150°, and 200° C, respectively. 

 In each case the oil was uniformly stirred and heated to the desired 

 temperature, whereupon the earth was added slowly and the stirring 

 continued for five minutes. The mixture was then filtered through a 

 force filter. Figure 2 illustrates the results obtained. 



It is evident that the proper temperature at which to effect the 

 treatment is about 100° C. At 25° C. practically no bleaching is 



