Firms in several countries continue to produce Zyklon B under alternative brand names, including Detia-Degesch, the successor to Degesch, who renamed the product Cyanosil in 1974. Hydrogen cyanide is now rarely used as a pesticide but still has industrial applications. Tesch, as well as his deputy executive, Karl Weinbacher, were executed in 1946 for knowingly selling the product to the SS for use on humans. The Nazis started using Zyklon B in extermination camps in early 1942 to murder prisoners during the Holocaust. Uses included delousing clothing and fumigating ships, warehouses, and trains. The new product was also named Zyklon, but it became known as Zyklon B to distinguish it from the earlier version. Their team of chemists, which included Walter Heerdt and Bruno Tesch, devised a method of packaging hydrogen cyanide in sealed canisters along with a cautionary eye irritant and one of several adsorbents such as diatomaceous earth. It was banned after World War I, when Germany used a similar product as a chemical weapon. Research at Degesch of Germany led to the development of Zyklon (later known as Zyklon A), a pesticide that released hydrogen cyanide upon exposure to water and heat. Hydrogen cyanide, a poisonous gas that interferes with cellular respiration, was first used as a pesticide in California in the 1880s. The product is notorious for its use by Nazi Germany during the Holocaust to murder approximately 1.1 million people in gas chambers installed at Auschwitz-Birkenau, Majdanek, and other extermination camps. It consisted of hydrogen cyanide (prussic acid), as well as a cautionary eye irritant and one of several adsorbents such as diatomaceous earth. Zyklon B ( German: ( listen) translated Cyclone B) was the trade name of a cyanide-based pesticide invented in Germany in the early 1920s. Zyklon labels from Dachau concentration camp used as evidence at the Nuremberg trials the first and third panels contain manufacturer information and the brand name, the center panel reads "Poison Gas! Cyanide preparation to be opened and used only by trained personnel"
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