STUDY OF DRIERS AND THEIR EFFECT 31 



parallel in nature, the tests afford nevertheless considerable 

 information for guiding future work of a similar nature. 



An examination of the results obtained showed generally that 

 the greatest increase in weight occurred during the period in 

 which the oil dried up to a firm film. This occurred in most cases 

 within 48 hours. After this period a slight increase in weight 

 was often noticed, and then a more or less steady decline, varying 

 with the oil examined. Had the oil tests been continued for a 

 greater length of time, a much greater loss might have been 

 observed. 



It was impossible to include in the tests the oil-silica film work, 

 on account of lack of time. It is believed, however, that these 

 tests should be conducted, as they would throw much light on 

 the elasticity and strength given to paint films by various oils. 



