56 



WOOD TUKPENTINES. 



CHANGES IN COMPOSITION" AFTER REFINING. 



The analyses of refined turpentines were made within a few days 

 after the refining. Afterwards these refined samples were kept for 

 considerable periods, some in glass carboys, others in wooden barrels 

 or iron drums, and further anlyses were made from time to time to 

 determine any changes in composition. Since the methods of storage 

 were not the same the results are not accurately comparable, though 

 they indicate the kinds and amounts of change which may take place 

 during storage. 



160 165 170 175 180 185 190 195 

 O .86 7 JB8 .89 30 3\ .92 S3 

 9 U68 1.470 1472 1474 1476 U78 U80 



FIG. 47. Boiling point, specific 

 gravity, and index of refraction 

 curves for the turpentine ob- 

 tained from crude No. 1 analyzed 

 after six months. 



ieO 165 I7O 175 180 185 190 195 

 O .86 SI S 3 30 ..91 .92 .93 

 O I46S 1470 1472 1474 L476 M78 L4.8O 



FIG. 48. Boiling point, specific 

 gravity, and index of refraction 

 curves for the turpentine obtained 

 from crude No. 2 analyzed after 

 nine months. 



Kefined turpentine No. 1, the original analysis of which is shown 

 in figure 24, was analyzed again after six months. (See fig. 47.) 

 The only change which had taken place in this time was an increase 

 in the amount of heavy residue from about 6 to 10 per cent; the 

 odor and color had not been appreciably affected. 



Refined turpentine No. 2 (original analysis, fig. 28) was analyzed 

 after nine months (fig. 48) ; during this period the heavy residue 

 had increased from 3.5 per cent with a gravity of 0,885 to 5.5 per 



