j?AB,T I.] Pukan Singh: Turpentine Oil and Indian Rosin. S3 
Number. 
Description of the treatment. 
i 
Colour as observed. 
Remarks. 
E 
2 mds. colophony added to 1 sr. 
nitre alone. 
Reddish yellow. 
F 
2 mds. rosin added to \ sr. nitre 
alone. 
Reddish tinge, trans¬ 
parent pale. 
Gr 
2 mds. rosin clarified with \ seer 
nitre. 
Light colour. 
H 
2 mds. rosin clarified with 2 srs. 
alum plus J seer nitre. 
Reddish pale lemon 
colour. 
I 
Rosin clarified by alum crystalline, 
1 sr. to 1 md. 
Pale. 
J 
Prepared by re-melting the rosin 
clarified by alum alone, jbo 
Deep colour with 
reddish tinge. 
The process of clarification followed in the above experiments may¬ 
be summed up as follows : — 
It is better to take the molten rosin as it comes out of the 
still to a separate clarifying shed fitted up with the 
required number of copper cauldrons preferably 
tinned inside and set in a suitable furnace. The rosin 
has to be heated over an open fire for some time, in 
order to drive off the last traces of the turpentine oil, 
preferably with a small quantity of water. When 
rosin begins to seethe the clarifying mixture in fine 
powder has to be introduced and the whole mass 
stirred from time to time. When alum, losing all its 
water of crystallisation, comes to the surface in the 
form of a sponge, the fire may be drawn off from below, 
the alum skimmed off and the clarified rosin filtered 
through a fine cloth. Finally it is moulded and 
packed. 
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