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Superfat refers to the amount of extra fat or oil added to a soap recipe that remains unsaponified after the chemical reaction with lye. In simpler terms, it is the leftover oil that does not turn into soap but stays in the bar to provide extra nourishment and moisture. When soap is made, oils react with lye (sodium hydroxide) to create soap molecules and glycerin. If the recipe is perfectly balanced, all the oils convert into soap. However, soap makers often add a small perc