There is improper and unsafe instructions in this book with mixing lye and water. You should always ADD LYE TO WATER, not the other way around. Adding water to lye can splash back at you and burn you.
As well, the ingredient measurements in this book are by volume. For more accurate results weight of ingredients should be used. Doing it by volume risks not having enough oil for lye and you could have unreacted lye in your final product.
I recommend a kitchen scale and another book. This one is not a good resource. Especially not recommend for learning to make soap for the first time.
I caution anyone following the guidance in this book. It has a very big safety error:
- The author gives instruction (multiple times) to add water to the Sodium Hydroxide. You should not do this! When you add water to Sodium Hydroxide a considerable amount of heat is released which can cause the mixture to splatter, shatter the container, etc., Considering that this is an extremely corrosive material specially to the eyes, the consequences can be serious. In a chemical lab, NaOH is handled with extreme care, goggles and gloves being mandatory. Even fairly dilute solutions of NaOH can cause loss of an eye even in short exposures BEWARE!
Instead, you should measure the water and slowly add the Sodium Hydroxide to the water. The order makes a difference. There will be a bit of steaming and foaming, but it will not explode in your face.
Also, the recipes use measurement (e.g. 1/2 cup) instead of weight (e.g. ounces) which makes for imprecise soap making.
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