Sesame Oil.—Sesame oil is very largely pressed in Southern France from the seeds of the sesame plant which is cultivated in the Levant, India, Japan and Western Africa.
A fairly representative sample of French expressed oil tested:—
| Specific Gravity at 15° C. | Saponification Equivalent | Acidity (as Oleic Acid) Per Cent. | Titre, °C. | Refractive Index at 20° C. |
| 0.9227 | 295.2 | 1.84 | 22.8 | 1.4731 |
Sesame oil should absorb 108 to 110 per cent. iodine.
Linseed Oil.—Russia, India, and Argentine Republic are the principal countries which extensively grow the flax plant, from the seeds of which linseed oil is pressed. It is used to a limited extent in soft-soap making.
A good sample gave on analysis:—
| Specific Gravity at 15° C. | Saponification Equivalent | Acidity (as Oleic Acid) Per Cent. | Titre, °C. | Refractive Index at 15° C. |
| 0.935 | 292 | 1.2 | 20 | 1.4840 |
Linseed oil should absorb 170 to 180 per cent. iodine.
Hemp-seed oil is produced from the seeds of the hemp plant which grows in Russia. This oil is used in soft soap-making, more particularly on the Continent.
A typical sample gave the following figures:—