Sodium Hydroxide

In soapmaking, sodium hydroxide is added to heated oils to create a chemical reaction that turns the oil into soap, together the two things become a third and different thing effectively. During the 8-10 week curing time, the water used to dilute the sodium hyroxide evaporates out, taking with it any last traces of sodium hydroxide and the finished bar is left caustic free and perfectly safe to use, even on sensitive skins.