For example, the slow reaction of handmade soap will lead to incomplete reaction. Sodium hydroxide, which has not had time to react, is a very alkaline substance, which may irritate the skin and even burn it. In order to avoid this terrible consequence, all hand-made cold water baths will be mentioned? Let it mature in a few weeks. . Unfortunately, the saponification reaction ratio at room temperature is 50? In addition, the contact area between oil and sodium hydroxide becomes smaller, which further reduces the reaction rate. So handmade soap is really not milder than industrial soap. On the contrary, there is always strong alkali in the process of making handmade soap, which will destroy it? Natural nutrients? In a word, the strong alkali content of handmade soap is often too high to be accurately detected, so it may not be a good idea to wash your face. If you must use it to wash your face, you'd better leave it for a long time.
As far as I know, when making soap, some spices, plant extracts, glycerin and other substances will be put in the process of melting and casting the soap base, and the temperature can be controlled within 60 degrees Celsius, so that the added natural nutrients will not be destroyed by high temperature.
Sodium fatty acid is used in both manual and industrial manufacturing, and the quality of sodium fatty acid determines the decontamination ability of soap. But the reaction temperature of handmade soap is also different from that of industrial soap. Handmade soap 60? Below c, industrial soap is often 90- 105? C. In my opinion, in the process of making soap by hand, some soaps are not disinfected at every step like industrial production, and the manufacturing process is a bit rough. So it is a bit biased to say that handmade soap is healthier than industrial soap. However, sometimes things made by hand are also very good.