Abstract
The author has investigated which of the removing actions are better flowing-out and the steeping methods for the yolk of greasy wool, from the results reported in Parts 2 and 3. It was found that the flowing-out method was excellent for every solvent. In the fourteen kinds of solvent used for experiment, methylene chloride was found the best solvent and the next carbon tetrachloride for removing the yolk. Kerosene was unexpectedly excellent too. Acetone, methyl ethyl ketone, anon and ethyl ether were extremely inferior.The author has also made the experimental measurements concerning the fatigue property of liquor that was accompanied by repetition of degreasing treatment for the eight kinds of typical solvent. The fatigue property of each solvent was very remarkable in the case of the flowing-out method, but one was comparatively little in the case of the steeping method.
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