Mazur gave a recipe that read: ""5 kilos of human fat are mixed with 10 liters of water and 500 or 1,000 grams of caustic soda. All this is boiled 2 or 3 hours and then cooled. The soap floats to the surface while the water and other sediment remain at the bottom. A bit of salt and soda is added to this mixture. Then fresh water is added and the mixture again boiled 2 or 3 hours. After having cooled, the soap is poured into molds."" 