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Zyklon B

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This article is about the cyanide-based pesticide used against humans during the Holocaust. For the Norwegian black metal band, see Zyklon-B (band).
Empty poison gas canisters, found by the Allies at the end of World War II.

Zyklon B (German pronunciation: [tsykloːn ˈbeː]; also spelled Cyclon B or Cyclone B) was the trade name of a cyanide-based pesticide infamous for its use by Nazi Germany against human beings in gas chambers of extermination camps during the Holocaust.

It consisted of hydrogen cyanide (prussic acid, Blausäure in German, hence B[1]), a stabilizer, a warning odorant, and one of several adsorbents.

History

Zyklon B labels
A can of Zyklon B with adsorbent granules and original signed documents detailing ordering of Zyklon B as "materials for Jewish resettlement" (display at Auschwitz I museum)

Even before any of the modern methods to mass produce prussic acid were developed, first suggestions to use it systematically to kill humans surfaced. A Berlin pharmacist is credited with the proposal to use rags with prussic acid placed on bayonets to combat the advancing Napoleonic army in 1813[2]. During World War I, the French army reportedly – according to Fritz Haber, the German chemist who helped develop poisonous gas for German Army use – used 2000 tons of prussic acid as a poison gas agent in artillery ammunition.[3]

Widespread 'biological' application of hydrocyanic acid was initially limited to the fumigation of valuable tree crops, namely of citrus fruit, spreading 1887 from California[4] to Spain and other countries using liquid prussic acid or calcium cyanide or sodium cyanide preparations. During World War I other HCN-based pest control applications were developed, and soon fumigation of ships, stores, factories, and even residential buildings with hydrocyanic acid gas became a popular method to combat insect and rodent pests in many countries.[5] Thousands of ships, cereal mills and other food processing factories were fumigated with hydrocyanic acid gas until the mid 1930s in Germany alone.

Degussa had a leading role in the German research on pest control with hydrocyanic acid gas from 1916/17 on[6]. Degussa's ("Deutsche Gold- und Silber-Scheideanstalt") expertise in handling HCN resulted from its use in the extraction of gold from gold ore. Initially, the so-called pot method was used to simply generate HCN gas by treating sodium cyanide or potassium cyanide with diluted sulfuric acid in a pot[7]. The pot method has a number of disadvantages - as has the utilisation of highly concentrated liquid prussic acid. The disadvantages include, e.g., limited chemical stability for long-term storage, and the formation of a highly explosive air-HCN mixtures upon application.

In March 1919 Deutsche Gesellschaft für Schädlingsbekämpfung mbH (Degesch) was founded by a consortium of German chemical companies including Degussa, and initially led by chemistry Nobel laureate Fritz Haber. Haber had World War I experiences in the development of poison gas for the German chemical warfare program. At Degesch, Ferdinand Flury developed Zyklon A in 1920. Its development was a major advance over previous methods to deliver hydrocyanic acid for pest control because of its improved chemical stability and the presence of a warning odorant.[8]

Walter Heerdt, Bruno Tesch and Gerhard Peters all were collaborators of Fritz Haber working at the Kaiser Wilhelm Institute for Physical Chemistry and Electrochemistry at Berlin-Dahlem. Out of this group of Haber assistants, Walter Heerdt was named the official inventor of Zyklon B in a Degesch patent application from 20 June 1922 (number DE 438818). Reichspatentamt awarded the patent on 27 December 1926.[9] The main invention in Zyklon B consisted of the absorption of liquid hydrocyanic acid to a highly porous adsorbent. Initially, heated diatomite (diatomaceous earth) was used as an adsorbent. Later, high-porosity gypsum pellets called Erco-dice (described by eye witnesses as "crystals") as well as disks made from wood fibre were also used. The adsorbed hydrocyanic acid was very safe in handling and storage when placed in inexpensive airtight cans of various sizes.[10] Gerhard Peters, manager of Degesch, cites M. Kaiser to the effect that

"Heute ist die Zyklon-Blausäure als "das Mittel der Wahl" [...] nicht nur zur Entwanzung und Entlausung, sondern ganz allgemein zur Entwesung großer Räume in allen Erdteilen bekannt. (Today Zyklon-prussic acid is known as the means of choice [...] not only for debugging and delousing but also, in general, for the extermination of large spaces in all quarters of the globe.)

From 1929 onwards the U.S. used Zyklon B to disinfect the freight trains and clothes of Mexican immigrants entering the US.[11] Farm Securities Administration photographer Marion Post Wolcott recorded the use of cyanide gas and Zyklon B by the Public Health Service at the New Orleans Quarantine Station during the 1930s.[12]

In early 1942, Zyklon B had been selected by the Nazi Regime as the preferred extermination tool for both the Auschwitz-Birkenau and Majdanek extermination camps during the Holocaust. The chemical claimed the lives of roughly 1.2 million people in these camps.[citation needed]

Production

Degesch (short for "Deutsche Gesellschaft für Schädlingsbekämpfung mbH"; lit. German Limited Company for Pest Control") played a key role in the manufacturing of Zyklon B in World War II. Many German companies had stock in Degesch, but all eventually sold their shares to the chemical giant Degussa (now known as Evonik) in the early 1920s. Degussa developed the process to manufacture Zyklon B in "crystals" (actually silica gel absorbent chunks), as it was used during World War II. To raise capital, Degussa split its controlling interest of Degesch with IG Farben in 1930: both companies held a 42.5% share in Degesch, with the remaining 15% held by the Th. Goldschmidt AG of Essen.[citation needed]

Degesch's role at this point was limited to acquiring patents and intellectual property: it did not itself produce Zyklon B. The manufacture of Zyklon B was handled by the Dessauer Werke für Zucker and Chemische Werke, which acquired the stabilizer from IG Farben, the warning agent from Schering AG and the prussic acid from Dessauer Schlempe and assembled them into the final product. This company extracted prussic acid from the waste products of the sugar beet refining process. From 1943 to 1945, the Kaliwerke, from the Czech town of Kolin, also supplied prussic acid to the Dessauer Werke.[citation needed]

Upon production, Zyklon B was sold by Degesch to Degussa. To cut costs, Degussa sold the marketing rights of Zyklon B to two intermediaries: the Heerdt and Linger GmbH (Heli) and Tesch and Stabenow (Tesch und Stabenow, Internationale Gesellschaft für Schädlingsbekämpfung m.b.H., or Testa) of Hamburg. Both suppliers split their territory along the Elbe river, with Heli handling the clients to the west and Testa doing the same in the east.[citation needed]

Zyklon B is still in production in the Czech Republic in the factory Draslovka Kolín a.s. in the city Kolín under the tradename Uragan D2, sold for eradicating insects and small animals.[13][14]

Use on humans

Use by Nazi Germany

See also: The Holocaust

Zyklon B was used by Nazi Germany to poison prisoners in the gas chambers of their network of extermination camps throughout Europe. Zyklon B was used at Auschwitz Birkenau, Majdanek, Sachsenhausen and one of the Operation Reinhard camps. At the other extermination camps, Carbon monoxide from engine exhaust was used in the gas chambers or mobile gas vans. Most of the victims were Jews and the Zyklon B gas became a central symbol of the Holocaust.

Zyklon B was used in the concentration camps also for delousing to control typhus. The chemical used in the gas chambers was deliberately made without the warning odorant.[15] In quantitative terms, more than 95% of the Zyklon B delivered to Auschwitz was used for delousing and less than 5% in the homicidal gas chambers.[16]

In January or February 1940, 250 Gypsy children from Brno in the Buchenwald concentration camp were used as guinea pigs for testing the Zyklon B gas.[17] On September 3, 1941, around 600 Soviet prisoners of war and 250 sick Polish prisoners were gassed with Zyklon B at Auschwitz camp I; this was the first experiment with the gas at Auschwitz. The experiments lasted more than 20 hours.

According to Rudolf Höss, commandant of Auschwitz, bunker 1 held 800 people, and bunker 2 held 1,200.[18] Once the chamber was full, the doors were screwed shut and solid pellets of Zyklon B were dropped into the chambers through vents in the side walls, releasing the cyanide gas. Those inside died within 20 minutes; the speed of death depended on how close the inmate was standing to a gas vent, according to Höss, who estimated that about one third of the victims died immediately.[19][20] Johann Kremer, an SS doctor who oversaw the gassings, testified that: "Shouting and screaming of the victims could be heard through the opening and it was clear that they fought for their lives."[21] When they were removed, if the chamber had been very congested, as they often were, the victims were found half-squatting, their skin colored pink with red and green spots, some foaming at the mouth or bleeding from the ears.[20]

Post-WW2 legacy

After the war, two directors of Testa – Bruno Tesch and Karl Weinbacher – were tried by a British military court and were executed for their part in supplying the chemical.

The use of the word Zyklon (German for cyclone) continues to prompt angry reactions from Jewish groups. In 2002, both Bosch Siemens Hausgeräte and Umbro were forced to withdraw from attempts to use or trademark the term for their products.[22]

Holocaust deniers say that Zyklon B gas was not used in the gas chambers, relying as evidence on the low levels of Prussian blue residue in samples of the gas chambers found by Fred A. Leuchter, which Leuchter dismissed as the results of general delousing of buildings. Leuchter's negative control, a sample of gasket material taken from a different building in the camp, registered as having no such cyanide residue.[23] The manager of the analytical laboratory hired by Leuchter states in an interview in Errol Morris' film Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr., that Leuchter's thick samples of brick would have greatly diluted the cyanide residue, which forms only an extremely fine layer on the walls and cannot penetrate.

In 1994, the Institute for Forensic Research in Kraków re-examined this claim on the grounds that formation of Prussian blue by exposure of bricks to cyanide is not a highly probable reaction [24]. Using more sophisticated microdiffusion techniques, they tested 22 samples from the gas chambers, delousing chambers (as positive controls), and living quarters (as negative controls), finding cyanide residue in both the delousing chambers and the ruins of the gas chambers but none in the ruins of the living quarters.[25]

References

  1. ^ Dwork, Deborah (1996). Auschwitz, 1270 to the present. Norton. p. 219. ISBN 0393039331. {{cite book}}: More than one of |pages= and |page= specified (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
  2. ^ http://www.holocaust-history.org/works/peters-1933/gif/peters16.gif
  3. ^ Peters, Blausaure zur Schadlingsbekampfungen (Stuggart, 1933), p. 17 (http://www.holocaust-history.org/works/peters-1933/gif/peters17.gif) citing in footnote 84 Fritz Haber, "Zur Geschichte des Gaskriegs" in "5 Vortraege", Berlin, p. 81, note 3
  4. ^ http://www.holocaust-history.org/works/peters-rasch-1941/htm/p133.htm
  5. ^ Peters (http://www.holocaust-history.org/works/peters-1933/gif/peters32.gif) cites a 1932 USDA bulletin where it is recommended even for careful private use
  6. ^ http://www.holocaust-history.org/works/peters-1933/gif/peters42.gif
  7. ^ http://www.holocaust-history.org/works/peters-1933/gif/peters45.gif
  8. ^ http://www.holocaust-history.org/works/peters-1933/gif/peters57.gif
  9. ^ US 0 
  10. ^ Peters (http://www.holocaust-history.org/works/peters-1933/gif/peters59.gif) and following pages
  11. ^ Spike, Paul (2007-05-31). "How America inspired the Third Reich". The First Post. Retrieved 2008-09-12.
  12. ^ Photographs are retained in the National Library of Medicine. WA 234AL6 no. 2
  13. ^ Product page
  14. ^ "Google Translation of the Adezin s.r.o. Product Information Page". Retrieved 2008-09-12.
  15. ^ Van Husen, William H. Zyklon B. World War II in Europe: An Encyclopedia. 1999.
  16. ^ http://www.holocaust-history.org/auschwitz/pressac/technique-and-operation/pressac0015.shtml
  17. ^ Emil Proester, Vraždeni čs. cikanu v Buchenwaldu (The murder of Czech Gypsies in Buchenwald). Document No. UV CSPB K-135 on deposit in the Archives of the Museum of the Fighters Against Nazism, Prague. 1940. (Quoted in: Miriam Novitch, Le génocide des Tziganes sous le régime nazi (Genocide of Gypsies by the Nazi Regime), Paris, AMIF, 1968)
  18. ^ Piper, Franciszek. "Gas chambers and Crematoria," in Berenbaum, Michael & Gutman, Yisrael (eds). Anatomy of the Auschwitz Death Camp, Indiana University Press and the United States Holocaust Memorial Museum, 1994, p. 162.
  19. ^ Auschwitz: Zyklon B
  20. ^ a b Piper, Franciszek. "Gas chambers and Crematoria," in Berenbaum, Michael & Gutman, Yisrael (eds). Anatomy of the Auschwitz Death Camp, Indiana University Press and the United States Holocaust Memorial Museum, 1994, p. 170.
  21. ^ Piper, Franciszek. "Gas chambers and Crematoria," in Berenbaum, Michael & Gutman, Yisrael (eds). Anatomy of the Auschwitz Death Camp, Indiana University Press and the United States Holocaust Memorial Museum, 1994, p. 163.
  22. ^ "Siemens retreats over Nazi name". BBC News. 2002-09-05. Retrieved 2010-04-20.
  23. ^ Shofar FTP Archive File: cyanide.002 The Nizkor Project
  24. ^ Amoklauf gegen die Wirklichkeit. Praca zbiorowa; B. Gallanda, J. Bailer, F. Freund, T. Geisler, W. Lasek, N. Neugebauer, G. Spenn, W. Wegner; Bundesministerium fuer Unterricht und Kultur Wien, 1991
  25. ^ "A Study of the Cyanide Compounds Content in the Walls of the Gas Chambers in the Former Auschwitz and Birkenau Concentration Camps". The Institute for Forensic Research, Cracow. 2000-01-15. Retrieved 2008-09-12.
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