Soya Bean Oil and Lead Drier
| Per cent. PbO | 0.05 | 0.10 | 0.30 | 0.50 | 0.70 | 1.00 | 1.30 | 1.60 | |||
| ⎧ | 1 | day | — | 0.07 | 0.63 | 1.34 | 1.05 | 1.53 | 0.93 | 1.35 | |
| ⎪ | 3 | days | — | 0.07 | 3.52 | 4.31 | 2.75 | 4.86 | 4.82 | 4.12 | |
| ⎪ | 5 | days | — | 0.09 | 5.04 | 6.06 | 6.09 | 6.75 | 6.66 | 5.52 | |
| Per ct. gain | ⎨ | 12 | days | — | — | 6.88 | 7.54 | 7.43 | 7.76 | 7.32 | 6.47 |
| ⎪ | 15 | days | — | — | 8.84 | 8.93 | 8.59 | 8.81 | 8.44 | 7.46 | |
| ⎩ | 20 | days | 0.05 | 0.20 | 9.02 | 9.08 | 8.90 | 9.03 | 8.65 | 7.83 | |
Soya Bean Oil and Manganese Drier
| Per cent. MnO2 | 0.01 | 0.05 | 0.15 | 0.26 | 0.30 | |||
| Per ct. gain | ⎧ | 1 | day | — | — | 0.02 | 0.02 | 0.01 |
| ⎨ | 10 | days | — | 5.06 | 6.48 | 6.10 | 5.97 | |
| ⎩ | 20 | days | 0.05 | 9.07 | 8.80 | 6.78 | 6.51 | |
Soya Bean Oil, Manganese and Lead Drier
| Per cent. PbO | 0.20 | 0.30 | 0.50 | |||
| MnO2 | 0.05 | 0.15 | 0.25 | |||
| Per ct. gain | ⎧ | 1 | day | 3.04 | 3.77 | 3.74 |
| ⎨ | 8 | days | 5.96 | 6.43 | 6.47 | |
| ⎩ | 12 | days | 6.33 | 6.78 | 6.67 | |
Tung Oil. There are grown in China and Japan many varieties of the “[aleurites cordata],” popularly known as the tung tree. This tree bears great quantities of large sized [nuts] containing as high as 40% of an oil which yields itself in a viscous yellow form upon heating and crushing of the fruit. The raw oil, which chemically consists of the glycerides of oleic, oleo-margaric, and probably isomeric acids, is distinguished by its rapid drying properties. When spread in a thin layer it produces a hard film with an opaque frosted surface, often showing a tendency to wrinkle. Treated tung oil will dry to a clear, water-shedding, elastic film. This oil is made by heating the raw tung oil at a comparatively low temperature with other oils and a metallic drier such as litharge.
Photographs courtesy of David Fairchild