Part I.] Puran Singh: Turpentine Oil and Indian Rosin . 49 
This shows that the redistillation should always be done in a 
separate still maintained for the redistillation of the oil alone, and 
not repeated in the still used for the crude resin. 
The quality of the redistilled oil is, therefore, as it ought to be, 
better than Z when only D is redistilled and is of the same quality 
as the redistilled oil obtained by steam distillation. Z has only 
80 per cent, passing below 165° C. and 91 per cent, passing below 
172° C. and a residue of 9 per cent, above 172° C., wthile on redistil¬ 
lation A+B+C+D has 80 per cent, passing below 165° C. and 
95 per cent, passing below 172° C and a residue of 5 per cent, above 
172° C. It may be remarked here that the oil can be further im¬ 
proved if subjected to further redistillation. But the repetition of 
the process of redistillation would entail a loss of 6—8 per cent, every 
time and thus an oil redistilled thrice though exceptionally pure, 
mostly passing below 165° C., would have lost 20 per cent, in weight. 
For the present, therefore, to refine our oil above this quality will 
not be advisable from a commercial point of view until the prices 
offered warrant such rectification, or any further difficulty arises 
in its disposal. 
Extra fine oil. 
A sample of redistilled A + B + C + D was subjected again to 
redistillation in the Laboratory and an extra pure oil was obtained. 
On fractional distillation it gave the following fractions: — 
155°—163° C. . . . . . . 55-0 per cent. 
163°—165° C.37*5 „ 
165°—172° C.7-5 „ 
Ncf residue. 
(ii) Redistilled Indian Turpentine compared with the Commercial 
Oils. 
The redistilled turpentine oil, it may be urged now, is decidedly 
superior to the turpentine available in the local markets. It may 
be mentioned here that two samples of good turpentine were ob¬ 
tained from Messrs. Fitch & Co., Chemists, Dehra Dun, one labelled 
as “ rectified for internal use ” and the other “ commercial spirits 
[ 49 ] 
