A general treatise on the manufacture of soap, theoretical and practical - Softcover
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...until the incorporation of the two is complete. There are certain soaps, that from coco butter as an example, which, being more soluble in salt solution than ordinary soap, require a greater amount of salt in the salting operation; and they must be dosed accordingly. 4. Clarifying or Finishing Operation.--Water, free alkali, and saline impurities of the lye still adhere to the soap. Moreover, there are some particles of it which have not entirely undergone saponification. To remove the first, and remedy the latter, therefore, it must be subjected to another operation, in order to cleanse it. This is done by boiling it in a liquor, which acts on the deteriorant substances without dissolving the soap itself. If the spent lye can be wholly drawn off from beneath the soap, the latter may remain in the same vessel; otherwise the paste must be scooped out into another kettle. It is then to be dosed with lye of 18 to 20 Baume, and containing eight or ten per cent, of salt, a quantity just enough to coagulate the soap sufficiently to prevent its adhering to the sides of the vessel. After gently boiling, during frequent stirring until the lye has lost its causticity, repose is allowed, and the settled waste lye drawn off. This treatment must be repeated with fresh lyes until the latter ceases to lose alkalinity. Approaching this point the hitherto steady ebullition becomes rather tumultuous and foamy. When the odor of violets is recognized, and the soap has no longer the smell of oil; and when, by pressing a little of the paste between the fingers, it scales without adhering to them, the clarifying is complete. In winter it should take eight or ten hours, but in summer ten or fifteen hours will be requisite; however, the length of time generally depends upon the qua...
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- VerlagRareBooksClub.com
- Erscheinungsdatum2012
- ISBN 10 1130318184
- ISBN 13 9781130318180
- EinbandTapa blanda
- Anzahl der Seiten214
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