I aim for no less than 40% solid in a 'normal' soap. If it's something special like a Castile, then of course rules were made to be broken!
my hard oils tend to be up to 70% sometimes as well. the recipe with least amount of hard oils is 30%. I can not decide which is my favorite. There is no right answer. It really depends on your recipe and the qualities you are trying to achieve.
Castile is pure olive oil--that's why it breaks his "rule", as it's a soap made with only a soft oil.
That's because the original Dr. Bronner was going for label appeal over accuracy.
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