41 
Part VI.] Preparation of Turpentine, Rosin and Gum. 
the material is sized in the pulp form and where there may be a loss of sizing agent 
through its being abstracted by the water in passing over the machine wire. Neither 
can we imitate the fusing effect of the hot drying cylinders. 
The results on these strips are, however, sufficiently good to warrant one of 
the mills being asked to try a parcel of this resin-waste say—100 lbs. A copy 
of the note and one or two of the attached strips should be sent to the mill manager 
as a guide for his proceedings. If he finds it useful it will also be cheap, for the 
material is a by-product and the amount of chemicals required for its treatment 
is much less than in the case of pine resin. 
(ii) Report on tests carried out bij the Titaghur Paper Mills Co., Ltd., with 
the Boswellia serrata Under-extracted Gum for Paper Sizing. 
The sample very kindly sent us by Mr. R. S. Pearson, has been submitted to 
tests under practical working conditions with the following results : 
The sizing solution was made up by dissolving 100 lbs. Resin with 3 per 
cent, of 77 cent. Caustic Soda in 90 gallons of water. 
Laboratory experiments had indicated that a high percentage of the Resin 
would be necessary for sizing purposes, so it was decided to divide the 
solution between two beaters of stuff. 
No. 1 This beater contained approximately 500 lbs. of stuff. The quantity 
of the sizing solution added was 40£ gallons, equal to 45 lbs. of resin. 
The solution was well beaten into the pulp, then 25^ lbs. of Alum added. 
After this was thoroughly mixed, the stuff in the beater gave a distinct acid 
reaction. 
The sizing results in the finished paper can only be considered fair. 
Sample sheets accompany this report. 
The quantities used represent Resin 9 per cent., Alum 5’1 per cent. 
No. 2. This beater contained approximately 550 lbs. of stuff. The quantity 
of sizing solution used was 49^ gallons equal to 55 lbs. of resin. 
The solution as before was well mixed with the pulp, then 55 lbs. of Alum 
added. 
In this case there was only a slight acid reaction. 
The actual result in the sizing of the paper was slightly better than trial No. 1. 
Sample sheets accompany the report. 
The quantity used represents 10 per cent. Resin and 4*63 per cent. Alum. 
Our average consumption of Naini Tal Resin works out 2 per cent, per ton of 
paper and Alum 4 to 5 per cent. 
Before any general conclusion can be drawn as to whether Boswellia serrata 
can be utilized for sizing paper, it will be necessary to make extended 
trials. 
It is possible that the high percentage of resin we found necessary would lead 
to trouble with wires and felts and afiso cause sticking at presses and 
calenders. 
In the case of White Paper, this excess of resin if actually found necessary 
after extended trials would, I fear, lead to early yellowing and rapid 
deterioration. 
We had some difficulty in getting the solution through the sieves and we found 
a good proportion of dirt and grit. 
Samples of paper sized with our own size accompany the others for comparison. 
[ 34 J 
