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This gentleman took samples from the walls of Auschwitz
His initial findings were that no residual cyanide was to be found on the wall scrapings.
But then, when he was asked to testify in the case he said that it was impossible to know if cyanide was on the walls. (this was interesting because by concluding that his tests were inconclusive he called into question his own competency regarding the initial tests)
Your demographics will let me know your initial position on the information you have presented for argument and discussion.
I am searching for information regarding the half-life of residual cyanide outside the body.
If you can give me a link to substantiate what you assert regarding no cyanide being found after 50 years then I would very much appreciate it.
I would recommend watching the video completely.
traces are still measurable till this day in the delousing chambers
cyanide would still be detectable after this period of time.
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. 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 . 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
And would it be practical to know from those measurements whether the chambers were used for murder or merely delousing? I'm guessing probably not.