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 
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TEMPERATURES CCE/VTj . 
Fig. 2.— Relation between the temperature maintained and the extent of the bleaching affected. 
at temperatures of 25°, 65°, 100°, 150°, and 200° C. 7 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 
