1919.] The Purification of Indian Sesame (Til) Oil. 323 
I ii iit Iv 
Tr, Om A Tr. Or B 
No. | Substance with All samples except 2 (a) and or. were fil- 
which ee oil |6 (a) were left in contact with the spr ng bot- 
was tre ‘substance mentioned in col. IT a onee. 
| 34 t ths exposed to 
the air bse filtered and 
ttled. 
6 |‘ Multani mut- ns vate tae once, oil appeare No improve- 
ti.’ ome fluor scent,darker sme ment apparent. 
sed int 
others an papas — cise layer was 
relatively thinne 
7 | French Cnalk.. | Very marked improvement a slight 
in colour and smell. Taste | be! A effect. 
roved. 
8 | Kharya mutti. Not tried. Moderate im- 
a bape in 
| ead: 
9& Quicklime  ..| Not tried. o improve 
10 —— cold or 
< 
11 Air driven Very small change in colour. Not tried. 
through for 6| Marked improvement in smell. | 
hours at 80°C. 
‘Multani mutti’ and ‘ kharya mutti’ are varieties of natu- 
rally ered Indian clay, most commonly met with in the 
Indian market 
EFFecT OF SUNLIGHT. 
In order to ascertain the effect on the oil, of sunlight in in 
absence of air, six test- tubes full of filtered ‘ Til’ Oil B and 
bors effect of sunlight. After intervals of a week each one 
tube was removed, stored in the dark, and compared with 
ie peice control sample of ‘ Til’ Oil B 
