Report of the Du Bosq colorimeter committee

Conclusion

• 1. The DuBosq Colorimeter is a beautiful instrument for measuring the relative amounts of the same coloring matter in two different liquids, providing the liquids are optically the same, and the coloring matter the same in both liquids.

• 2. Cotton Seed Oils contain several different coloring matters.

• 3. The effects of decomposition of the seed and the various conditions used in refining processes affect the light absorption of the oils, and the characteristics of the color.

• 4. These differences are made painfully apparent by the DuBosq instrument.

• 5. It seems quite apparent, considering the limitations of the human eye and the great differences of hue and brilliancy of different oils, that any system of numerically recording color differences must allow reasonable tolerances.

• 6. Although results to date appear discouraging, it is believed that by the aid of a modified Du-Bosq instrument a satisfactory practical method of oil colorimetry may yet be developed if carefully worked out.