Editing Fred A. Leuchter (section)

===Repeating of Leuchter report's tests===
In February 1990, Professor Jan Markiewicz, Director of the Forensic Institute of [[Kraków]], [[Leuchter report#Polish follow-up investigation|redid the analysis]]. Markiewicz decided that the [[Prussian blue]] test was unreliable because it depended on the acidity of the environment, which was low in the gas chambers. Markiewicz and his team used microdiffusion techniques to test for cyanide in samples from the gas chambers, from delousing chambers, and from living areas elsewhere within Auschwitz. The [[negative control]] samples from the living quarters tested negative, while cyanide residue was found in both the delousing chambers and the gas chambers. The amount of cyanide found had a great variability, possibly due to 50 years of exposure to the elements to varying degrees,<ref>{{cite web | url=https://www.nizkor.org/hweb/orgs/polish/institute-for-forensic-research/table-seven.html |archive-url=https://web.archive.org/web/20070606220306/http://www.nizkor.org/hweb/orgs/polish/institute-for-forensic-research/table-seven.html |archive-date=June 6, 2007 | title=A Study of the Cyanide Compounds Content in the Walls of the Gas Chambers in the Former Auschwitz & Birkenau Concentration Camps, Table VII. Results of Examination Concerning the Effect of Water upon the Concentration of Cyanide Ions in Plaster. Cracow: Institute of Forensic Research|publisher=[[Nizkor Project]]| date=March 8, 1994 | first=Jan | last=Markiewicz | access-date = March 4, 2007}}</ref> but even so, the categorical results were that cyanide was found where expected in both the gas chambers and the delousing facilities, and not found in the living quarters, supporting the hypothesis that the gas chambers were exposed to high levels of cyanide like the delousing facilities, and not low levels for routine fumigation, like the living quarters.<ref name="instforresearch">{{cite web | url=https://www.nizkor.org/hweb/orgs/polish/institute-for-forensic-research/ |archive-url=https://web.archive.org/web/20070607011910/http://www.nizkor.org/hweb/orgs/polish/institute-for-forensic-research/ |archive-date=June 7, 2007 | title=A Study of the Cyanide Compounds Content in the Walls of the Gas Chambers in the Former Auschwitz & Birkenau Concentration Camps. Cracow: Institute of Forensic Research|publisher=[[Nizkor Project]]| date=March 8, 1994 | first=Jan | last=Markiewicz | access-date = March 4, 2007}}</ref>