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... simple, so it has a high appearance rate in the novel.
Mix animal and vegetable oils with trona to form saponification.
Reheat and cook, stirring constantly, after several or even dozens of hours, the material is further saponified, and then salt is added to promote the coagulation of the soap base.
Then put the resting material in the model and fix it, which is the most original soap.
All materials can find natural substitutes, there is no deep processing ...
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