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What purpose does this serve in a whipped soap base? Just preservation? Is it possible to swap it out for another preservative? Or is there another reason that this one is chosen?

I’m Lindsey-Star. I’m from California now living in South Dakota. (Not a fan.) Cold process and Castile liquid are my favorite. I also like making body care. I would like to figure out how to effectively add tannins without them breaking down. For example, witch hazel. I have a history in...