Use as target temperature 25ºC-30ºC for the oil-solution mixture. It can be less than this, but the lye and oils should not have a difference of more than 10ºC between them. Pour the lye water into the oils carefully. Mix oils and lye with the immersion blender.
When I first started making liquid Castile soap, I made the pure Castile soap with only olive oil as often as I made a liquid soap using coconut oil. I figured that for face and body use, the pure liquid Castile soap would be a lot better to use because soaps made with olive oil are milder and more conditioning than soaps made with coconut oil.
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