Part I.] Pgran Singh : Turpentine Oil and Indian Rosin. 85 
Description .—The sample consisted of masses of pale brownish- 
yellow resin having the usual appearance and properties of colophony 
of good quality. 
Results of Examination. 
Moisture ....... 
Ash. 
Melting point (determined on the powdered resin 
in a capillary tube). 
Acid number (milligrams of potassium hydroxide 
required to neutralise one gram of resin). 
Saponification number ..... 
0-80 per cent. 
0*15 „ 
74° C. 
174 
184 
The ash yielded by the resin was a reddish-brown powder; the 
quantity obtained was insufficient for detailed examination. 
The analytical results show that this colophony is of good quality. 
Commercial valuation and remarks. —Samples of the colophony 
were submitted to merchants, who valued it at £14 to £15 per ton 
in the United Kingdom, and to a firm of soap-makers, who consi¬ 
dered it to be worth £13 per ton. The current value of American 
rosin of similar quality was £14-9-0 per ton. The merchants stated 
that the present prices are abnormally high and that £12 per ton 
could be regarded as a fair average price for this material. 
This Indian colophony is of much better quality than the pre¬ 
vious sample examined at the Imperial Institute and dealt with in 
the interim report on Indian turpentine, dated 27th July 1909 
(see below). As explained in that report, the value of rosin depends 
primarily on its colour, provided that the composition of the mate¬ 
rial as indicated by the usual constants is satisfactory. 
The present sample is not quite so pale as the best Bordeaux 
rosin, but it would be classed with the “ Water White ” grades of 
American rosin. There is no doubt that Indian rosin of this qual¬ 
ity would sell readily in the United Kingdom at good prices * * 
Extract from the Interim Report on Indian Turpentine , dated 
27th July 1909 , by Professor W. R. Dunstan , M.A., F.R.S ., 
Director , Imperial Institute , London. 
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