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Leuchter collected 31 handful-sized samples of bricks and mortar from the cremas and one control sample from the delousing chamber in Birkenau. By the time he crawled into the ruins of Crema 2, the plaster was long gone and only the bricks and mortar and concrete remained. Cremas 4 and 5 were constructed entirely of brick. They were totally destroyed before the end of the war. Only the concrete foundations remain and bricks have been gathered from around the area and loosely stacked up to show the general outline of the floor plan of the buildings. The bricks that Leuchter sampled did not necessarily come from anywhere near the gas chamber rooms.  

Leuchter collected 31 handful-sized samples of bricks and mortar from the cremas and one control sample from the delousing chamber in Birkenau. By the time he crawled into the ruins of Crema 2, the plaster was long gone and only the bricks and mortar and concrete remained. Cremas 4 and 5 were constructed entirely of brick. They were totally destroyed before the end of the war. Only the concrete foundations remain and bricks have been gathered from around the area and loosely stacked up to show the general outline of the floor plan of the buildings. The bricks that Leuchter sampled did not necessarily come from anywhere near the gas chamber rooms.  

In the laboratory the individual samples were ground up into powder. Any trace of the HCN residue that might have been there became a miniscule part of the entire sample. A more appropriate method would have tested only the surfaces of the sample.  Testing the total amount of the ground up powder was like trying to analyze the color and chemical structure of paint on the inside of a wall by looking for it in the boards and masonry behind the drywall. In the case of Cremas 4 and 5, it would like analyzing the materials from another room entirely.”  

In the laboratory the individual samples were ground up into powder. Any trace of the HCN residue that might have been there became a miniscule part of the entire sample. A more appropriate method would have tested only the surfaces of the sample.  Testing the total amount of the ground up powder was like trying to analyze the color and chemical structure of paint on the inside of a wall by looking for it in the boards and masonry behind the drywall. In the case of Cremas 4 and 5, it would like analyzing the materials from another room entirely.”  

The fact that even “insignificant traces” were found in the ruins of the gas chambers after all these years of being exposed to the elements is proof that there WERE gas chambers in Auschwitz-Birkenau.</ref>http://www.hdot.org/en/learning/myth-fact/leuchter</ref>   

The fact that Leuchter still found “insignificant traces” of the chemicals in the ruins of the gas chambers after all these years of being exposed to the elements is proof that there WERE gas chambers in Auschwitz-Birkenau.<ref>http://www.hdot.org/en/learning/myth-fact/leuchter</ref>   

A properly authorized and meticulously conducted, rigorously scientific study done by Polish authorities in 1994 found that “''in spite of the passage of a considerable period of time (over 45 years) in the walls of the facilities which once were in contact with hydrogen cyanide the vestigial amounts of the combinations of this constituent of Zyklon B had been preserved. This is also true of the ruins of the former gas chambers''.”

A properly authorized and meticulously conducted, rigorously scientific study done by Polish authorities in 1994 found that “''in spite of the passage of a considerable period of time (over 45 years) in the walls of the facilities which once were in contact with hydrogen cyanide the vestigial amounts of the combinations of this constituent of Zyklon B had been preserved. This is also true of the ruins of the former gas chambers''.”