Sodium Hydroxide in Soapmaking

Sodium hydroxide (NaOH), a.k.a. lye, is a crucial ingredient in making cold process soap. This highly alkaline compound, with a pH of around 13, triggers the saponification process. Saponification is where oils/fats combined with a lye solution (sodium hydroxide and liquid) transform into a solid bar of soap and glycerin. Although raw sodium hydroxide is highly reactive (requiring safety equipment to handle it), it becomes neutralized during the soapmaking process - and creates a safe, solid bar of soap.