The Leuchter Report: Holocaust deniers often claim that since more hydrocyanic compounds
were found in the delousing chambers than in the ruins of the
so-called "extermination" chambers at
Auschwitz, and the reverse
would be true if people were actually gassed there, it is clear that
no gassings occurred.
But -
HCN is far more effective on warm-blooded animals (including
humans) than on insects, so the period of exposure to
HCN is far
longer for delousing clothes than that required for homicidal
gassings, and a much lower concentration is necessary to kill people
instead of insects.
A concentration of up to 16,000 ppm (parts per million) is sometimes
used, with exposure times of up to 72 hours, to kill insects, but as
little as 300 ppm will cause death in humans within fifteen minutes
or so.
Breitman offers background information about the development of
Zyklon B as a killing device, and provides clear evidence that the
Nazis determined the effective Zyklon B concentration through a
process of trial and error.
(Get pub/camps/auschwitz/auschwitz.faq1)
When the difference in the concentration of gas required to kill
insects and humans was mentioned in Leuchter's cross-examination in
the
Zündel trial, Leuchter responded:
"
I've never killed beetles. I,
you know, I don't know. I haven't made computations for killing
beetles" - Hardly the response one would expect from an "expert" on
the subject...
Because of the relatively small concentrations required to
exterminate humans as opposed to lice, and because of the far shorter
exposure time required, the
HCN in the gas chambers used to kill
humans hardly had time to form chemical compounds on the walls.
The gas chambers were not very large (those in Kremas II and III were
about 210 square meters), and the
Zyklon B was dropped through four
openings in the roof, spreading the gas very quickly. These openings
are still visible in the ruins of the gas chambers, and rare
photographs of them, taken while the camp was in operation, exist,
and copies are readily available (Brugioni et al) from the sources
noted in Section 6.1, below. Since the concentration used was higher
than the lethal one, death was swift. (Get pub/holocaust/gifs/
krema4.gif -
Krema IV was above-ground, and the
Zyklon B was introduced through
clearly visible slits in the walls. See also ~/gifs/
c_krema4.gif,
which provides a closeup of the wall openings.
Leuchter's data is further suspect because the delousing chambers
where he obtained his samples were left intact by the SS, while the
extermination chambers were destroyed. Clearly, their walls were
exposed to the elements for forty-five years, which would certainly
effect the validity of the samples taken. (The ruins of Krema II are
covered with about three feet of water during certain periods of the
year, and
HCN compounds would eventually dissolve under such
conditions. Nonetheless, so many gassings occurred there that some
of the compound did remain).
Summarizing, the walls of the extermination gas chambers were in
contact with
HCN for a much shorter time then those of the delousing
chambers, and for the last 45 years were exposed to surroundings
which dissolve the compounds, while the delousing rooms were not.
Therefore it is obvious that less traces of compounds would remain in
them. This debunks the major "amazing discovery" in Leuchter's
report, which, in retrospect, wasn't 'amazing' at all.
This fact - that all, or most, of the compounds would vanish during
45 years of exposure - is quite clearly stated in the report written
by the experts at the
Cracow Institute of Forensic Research:
Krakow, 24 Sept. 1990
The hydrocyanic acid (HCN) that is released from the Zyklon B
Hydrocyanic acid is a very weak acid, and accordingly its salts
Stronger acids, such as sulfuric acids, easily dissolve the
Therefore, one can hardly assume that traces of cyanic compounds
The discovery of hydrocyanic acid compounds in samples of
The deniers often claim that the gas chamber in Krema I was left
intact, and therefore its walls were not exposed to the elements.
Curiously, they also make great issue of the fact that Krema I was
converted into an air-raid shelter, and then rebuilt by the Soviet
Army, after the liberation of the camp, to reproduce its original
shape, saying that it has been used to mislead the public, who were
told that people were gassed in the building. (The logic of their
holding both views when it seems advantageous to do so will perhaps
escape you, but then logic has not been a demonstrated asset when it
comes to Holocaust denial. See Section
3.0.)
The modification consisted of essentially removing some partitioning
walls inside the gas chamber, which were added as a common feature of
bomb shelters. Nontheless, this is the room in which people were
gassed; there are still traces of cyanide on its walls, as Leuchter admits (he found traces in 6 of 7 samples).
But - the gas chamber of Krema I was used only for a short time,
before the conversion. This, and the fact that "only" about ten
thousand people were murdered within it, compared to
three-hundred-fifty-thousand and four-hundred-thousand in Kremas II
and III, explains why relatively small amounts of cyanide compounds
remain. The other Kremas were destroyed by the SS prior to the
Soviet liberation.
Finally, cyanide compounds were found on the ventilation grills of
the extermination chambers, proving beyond doubt that gassing did
take place within.
The most current plaintext version of
Part One and
Part Two of this FAQ is available via
ftp.
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Disparities in Hydrocyanic Compound Levels
INSTITUTE OF FORENSIC RESEARCH
In the name of Prof. Dr. Jan Sehn, Krakow
Division of Forensic Toxicology
Westerplatte 9 / Code 31-033
Tel. 505-44, 592-24, 287-50
Telex 0325213 eksad ...
preparation is a liquid with a boiling point of about 27 degrees
Celsius. It has an acidic character, and therefore forms
compounds with metallic salts, which are known as cyanides. The
salts of alkaline metals (such as sodium and potassium) are
water soluble.
dissolve easily in stronger acids. Even carbonic acid, which is
formed as a reaction of carbon dioxide with water, will dissolve
ferro-cyanide.
cyanides. The compounds of cyanide ions with heavy metals are
longer lasting. This includes the already mentioned Prussian
blue, although this will also slowly dissolve in an acidic
environment.
could still be detected in construction materials (plaster,
brick) after 45 years, after being subjected to the weather and
the elements (rain, acid oxides, especially sulfuric and
nitrogen oxides). More reliable would be the analysis of wall
plaster [samples] from closed rooms which were not subject to
weather and the elements (including acid rain).
material which had been subject to the elements can only be
accidental.