Soap is made with lye and oil or fat and liquid. There is no exception; without the sodium hydroxide or lye, there is no soap. It is part of the chemical process. You are combining an oil in the lye. It's alkaline and acidic, and I believe that is what makes the salt oil and not the salt soap. It's a chemical combination and once it has all been combined together there is no lye left. It is the neutralized by the process. When it's properly combined, this combination makes soap plus the byproduct of glycerin. Glycerin keeps your skin soft and most commercial companies take the glycerine out of the soap because it clogs up their machinery. Then they get more money by selling it to the cosmetic industry. I sell a kit that has everything all weighed out and ready to go.