Soap-making Manual, by E. G. Thomssen, Ph. D.

https://www.ajhw.co.uk/books/book431/book431.html

Earth Process for Bleaching Tallow 4-6 Method for Further Improvement of Color in Tallow 6 Vegetable Oils 6-9 Chrome Bleaching of Palm Oil 9-12 Air Bleaching of Palm Oil 12-16 5.

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