The oil has given fair service in some paints when mixed with upwards of 75% of pure linseed oil. It is of a semi-drying nature, but may be made to dry rapidly when mixed with manganese and lead linoleate driers. By compounding it under heat with tung oil and rosin, a substitute for linseed oil is produced, which some claim to be quite valuable.
[Table I] gives the constants of several samples of soya oil examined by the writer. [Table II] shows the iodine value of mixtures of soya and linseed oils. [Table III] shows the results of drying experiments on soya oils containing different percentages of lead and manganese driers.
TABLE I
Chemical Characteristics of Soya Bean Oil
| Sample No. | Specific gravity | Acid No. | Saponification No. | Iodine No. | Per cent. of foots |
| 1 | 0.9233 | 1.87 | 188.4 | 127.8 | 3.81 |
| 2 | 0.9240 | 1.92 | 188.3 | 127.2 | — |
| 3 | 0.9231 | 1.90 | 187.8 | 131.7 | — |
| 4 | 0.9233 | 1.91 | 188.4 | 129.8 | — |
| 5 | — | — | — | 130.0 | — |
| 6 | — | — | — | 132.6 | — |
| 7 | — | — | — | 136.0 | — |
| Average | 0.9234 | 1.90 | 188.2 | 130.7 | — |
TABLE II
Iodine Values of Linseed Oil and Mixed Oils
| Sample No. | Straight linseed | Soya 25 per cent. Linseed 75 per cent. | Soya 50 per cent. Linseed 50 per cent. | Soya 75 per cent. Linseed 25 per cent. |
| 1 | 190.3 | 175.2 | 160.7 | 140.4 |
| 2 | 189.5 | 175.9 | 161.7 | 140.8 |
| 3 | 188.0 | 175.4 | 160.3 | 139.0 |
| Average | 189.3 | 175.5 | 160.9 | 140.4 |