Why are soaps so drying even though they are mostly made up of oils?
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Soaps are made of *saponified* oils. This is a chemical reaction where a strong base (such as lye) reacts with a fatty material (such as vegetable oil or animal fat) to create alcohol and soap. So, soap is a whole different kind of molecule than the oil that you make it out of, with different properties. It will lift oil out of your skin rather than add oil to it.
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