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Updated: May 3, 2025
The residue is kept, and the method of treating it for the recovery of indigo will afterward be described. The fatty acids are now ready for conversion into soap. It may here be remarked that, on distillation, they yield a nearly white fatty mass, which, when treated with soda-lye, is capable of yielding a perfectly white soap. But, for the clothworker's purpose, this purification is unnecessary.
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