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Part VI.] Preparation of Turpentine, Rosin and Gum. 33 
turpentine oil from the testing of small samples in a laboratory, and expressed their 
willingness to make large scale trials with this Boswellia turpentine oil. If the 
product is likely to be procurable in large quantities for export it would be desirable 
to forward at least 2 cwt., to the Imperial Institute for submission to this and other 
firms who are willing to conduct large scale trials with it. 
(ii) Report by the Imperial Institute, South Kensington, London. 
The Turpentine Oil was submitted to two firms of varnish manufacturers for 
trial and commercial valuation, with the following results. 
(1) The first firm stated that they had prepared for comparison two varnishes, 
one with genuine American turpentine oil and th3 other with the Boswellia turpen¬ 
tine oil, the remaining constituents in each case being the same, and had found 
that the Boswellia turpentine oil rendered the varnish slightly dull, whereas the 
varnish made with American turpentine oil remained bright. Equivalent quan¬ 
tities of Boswellia turpentine being considerably thinner. The drying and “ face 
of the finished varnishes were, however, practically identical. 
The firm considered that as a substitute for American turpentine oil 
the Boswellia oil would probably be placed between French or Spanish and Sv edish 
or Russian turpentine, but they were unable to assign a definite commercial value 
to it under present conditions. 
(2) The second firm reported as the result of practical trials that this turpen¬ 
tine oil has a tendency to accelerate the drying of varnishes but that it detracts 
from their brilliancy and durability for exterior work. They stated that there 
is apparently no rea.son why Boswellia turpentine oil should not be utilized in the 
varnish trade. 
Remarks. 
The results of the investigation of this sample of Boswellia turpentine oil indicate 
that it differs from the preceding sample in containing a much larger percentage 
of the higher-boiling constituents, but that nevertheless the varnish prepared 
with it dries rather quicker than that made with ordinary commercial turpentine 
oil. The inclusion of the higher-boiling fractions does not appear to have any 
adverse efEect on the quality of the varnish, so that it would seem unnecessary 
to remove these fractions in preparing the Boswellia oil for commercial use. The 
> best rule on this point would probably be to make the product agree in range of 
boiling point with commercial American turpentine, as previously suggested in 
the report, dated the 4th May 1915. 
There seems to be little doubt that this Boswellia turpentine oil could 
be successfully utilized for varnish-making in place of ordinary turpentine oil 
but it is not possible to state its exact commercial value until the product has been 
tried on a considerable scale. 
(Hi) Report from the Superintendent , Gun Carriage Factory, Ordnance 
Depot, Jubbulpore. 
I have had the sample of turpentine tested and have found ♦it to be most 
satisfactory for paint work. 
If you contemplate producing this in fairly large quantities, I suggest you 
address the Director of Ordnance Factories, 6, Esplande East, Calcutta, intimating 
the probable output, and probable cost per gallon. 
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