To: tbolding who wrote (737208 ) 9/4/2013 9:13:58 PM From: jlallen Respond to Holocaust deniers claim that Zyklon B gas was not used in the gas chambers , relying for evidence on the low levels of residues of Prussian blue in samples of the gas chamber walls and ceilings found by Fred A. Leuchter , which Leuchter ascribed to the general delousing of the 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. [34] chemical laboratory hired by Leuchter stated in an interview in the movie Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr. , that Leuchter's thick samples of brick would have diluted completely the cyanide residue, which formed only a very fine layer on the masonry walls and cannot penetrate deeper.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. [35] 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. [36] 34 ^ Shofar FTP Archive File: cyanide.002 The Nizkor Project 35 ^ 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, 1991.36 "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.
