Abstract
Cotton fabric was soiled with an ointment of lamp black and vaseline, lard, or medicinal mineral oil. After washing in a special machine, the residual soil was evaluated by a colorimeter used as a reflectometer. Of pure sodium laurate, myristate, palmitate, stearate and oleate, the latter was the most powerful up to 40°C., while palmitate took first place at 60°C. and stearate at 80°C. Addition of sufficient appropriate fat—solvent enhanced detergent power. In parallel with the writer's findings on emulsification, excess fatty acid enhanced detergent power while excess alkali decreased it. Other resemblances between emulsification and detergency were not distinct.
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