Soapmaker's Compound is a combination of LYE, which is a type of alkali, and fats or oils. LYE is a corrosive substance that is used to make soap, and when combined with fats or oils, it creates a chemical reaction that produces soap. The LYE used in soapmaking is usually sodium hydroxide or potassium hydroxide. Soapmaker's Compound is an essential ingredient in the soapmaking process, as it helps to create a product that is both cleansing and moisturizing.