Scientific Soapmaking: The Chemistry of the Cold Process (英語) ペーパーバック – 2010/4/8
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Until now, there were just two kinds of books on soapmaking. Books for the commodity soap industry emphasized the economical production of soap by the ton and were written for those with a background in chemistry and chemical engineering. Books for the emerging craft industry emphasized the production of high-quality soap by the pound and were aimed at those familiar with the format of cookbooks. Makers of handcrafted soap often wish they had paid more attention in chemistry class so that the information of the commodity soap books would be accessible to them. Scientific Soapmaking answers that call by bridging the gap between the technical and craft literatures. It explains the chemistry of fats, oils, and soaps, and it teaches sophisticated analytical techniques that can be carried out using equipment and materials familiar to makers of handcrafted soap. Presented in a college textbook format, Scientific Soapmaking guides students and individual soapmakers alike to formulate questions about soap and design experiments to answer those questions scientifically.
The last half explains a few experiments he did to test various qualities in soap like whether there is a difference in a lye discount and superfatting. I found the explanation of soap curd vs neat soap to be very interesting and the experiment on melted soap vs unmelted in water was enlightening. This is a book I recommend you read if you want to know more about making soap than what you'd find in a youtube video.
You will need to read it over and over but it does become clear as you move along. This was never meant to be an "Instruction book" but rather a class in which the author experimented with students and documented very detailed results.