Testimony of Sigmund Mazur During the Nuremberg Trials, Sigmund Mazur, a laboratory assistant at the Danzig Anatomical Institute, testified that soap had been made from corpse fat at the camp, and claimed that 70 to 80 kg of fat collected from 40 bodies could produce more than 25 kg of soap, and that the finished soap was retained by Professor Rudolf Spanner. Eyewitnesses included British POWs who were part of the forced labor that constructed the camp, and Dr. Stanisław Byczkowski, head of the Department of Toxicology at the Gdańsk School of Medicine. Holocaust survivor Thomas Blatt, who investigated the subject, found little concrete documentation and no evidence of mass production of soap from human fat, but concluded that there was evidence of experimental soap making. Danzig was the German name of the now-Polish city of Gdańsk. The recipe given by Mazur 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." Testimony was given both by Nazis and by British prisoners of war about the development of an industrial process for producing soap from human bodies, the production of such soap on a small-scale basis, and the actual use of this soap by Nazi personnel at the Danzig Anatomic Institute.
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from the article: New Israeli film debunks myth that Nazis made soap from Jews