Railroad Delousing Tunnels and Robert Faurisson

[Kiwichap]

Thinking back, was there ever a warning scent? Did it say 'scent' on the can? It would be pointless to try and smell anything with chloropicrin in the air. Your nose would pack it in straight away. Cyanide is readily respirable, they encourage you to take big breaths. Try that with the warning chemical and see how far you get.

It is commonly known worldwide as a warning 'chemical' and cyanide is a great partner. Could this 'scent' thing be a hoaxy construct?

[Kiwichap]

Note that the "special odor" to which Borkin refers was not merely an offensive odor, but an irritant. When used for delousing, this served two purposes. The first was to ensure that anyone accidentally exposed to the gas, even if they did not know what was happening, would leave the area immediately to relieve the symptoms of burning eyes and throat. The second purpose was to increase the respiration of insects and thus to cause them to die more quickly. This is clear upon examination of document number NI-9912, commonly known as the "Degesch manual" for the use of Zyklon. On page one, the manual states explicitly: ZYKLON is the absorption of a mixture of prussic acid and an irritant by a carrier. Wood fibre discs, a reddish brown granular mass (Diagriess - Dia gravel) or small blue cubes (Erco) are used as carriers. Apart from serving its purpose as indicator, this irritant also had the advantage of stimulating the respiration of insects. Prussic acid and the irritant are generated through simple evaporation. If, as the denial set maintains, the S.S. had only wanted Zyklon B for insect control, they would most certainly not have wished to remove not only the warning device, but also the chemical that made the prussic acid more effective. That would have been not only counterproductive but also quite dangerous. It also seems clear that the only conceivable reason to remove the indicator odor would be to disguise the killing agent from the victims - hydrocyanic acid has only a weak odor described sometimes as like "bitter almonds," or, as in the Degesch manual, "peculiar, repulsively sweet." In short, it shows clear intent, thus refuting yet another denial myth - that there was no organized plan to exterminate anyone.

Work Cited Borkin, Joseph. The Crime and Punishment of I.G. Farben. New York: The Free Press, 1978, and London: Macmillan Publishing Company.

http://boards.historychannel.com/thread ... =700280982

[Friedrich Paul Berg]

Here are two more images of railroad delousing tunnels from the German literature:



The above is from Roumania and is the largest RDT that I have ever seen in the German literature. It could have been a kind of Sistine Chapel for mass extermination. Just imagine all that ceiling space filled with murals by Marc Chagall! It even has a chimney!


The above expains itself and was in Sarajevo, Yugoslavia.

From the captions, both of these tunnels inlcuded the widely promoted Kreislaufsystem which was simply a common sense arrangement to warm the air before it was blown through the Zyklon-B granules before it was, in turn, all blown throughout the chamber. The fumigating phase was followed by a venting phase during which fresh air was blown throughout the chamber to remove nearly every last trace of cyanide. Nonetheless, although it is not spelled out for railroad delousing, some additional fresh air venting might have been used as well since it was standard practice for much smaller Kreislauf units that fumigated primarily clothing.

As to the behaviour of cyanide, it is slighlty less dense than air and, therefore, tended to rise and NOT accumulate near the ground. This helped in venting and was one reason why it was not very useful as a military combat gas.

Friedrich Paul Berg
Learn everything at www.nazigassings.com
Nazi Gassings Never Happened! Niemand wurde vergast!

[Wahrheit]

Wahreit, I don't know where this is going but one thing is for certain, you cannot drive a train with wagons exposed to HCN anywhere.

Why not? You can wear clothes exposed to it.

These wagons were apparently fumigated in groups of perhaps a dozen, by the look of Bergs photos. Moving a dozen wagons in and out of a fumigation shed requires at least four people. The driver, the fireman and the shunter and the shed worker, you know, the guy who opens the doors. Shunters usually work in gangs of three or more. These wagons are put in sidings while the rest of the wagons are processed. When finished the train is assembled and on its way. Having a lot of wagons, ie, closed box car wagons, sitting around on a siding reeking of HCN is something nobody would ever want or have. On a still day its a death trap.

As shown by Berg's article, a powerful ventilation unit was installed in these wagon delousing chambers.

And it could easily be vented by a simply open door and given some time to air out, and then the workers (who could just as well wear protective suits and masks) would be considerably more safer. Unless the chamber's temperature was exactly that of the outside, ventilation would occur evenw ithout any blowing mechanism.

Cyanide is deadly, not only in a certain concentration, but also in exposure of lesser amounts over a longer time.

A recent study reports an estimated LC(50) in humans of 3,404 ppm for a 1-minute exposure; other sources report that 270 ppm is fatal after 6 to 8 minutes, 181 ppm after 10 minutes and 135 ppm after 30 minutes

I'd be interested to see just where this "recent study" comes from. And theres no question lesser quantities for longer periods of time can still be lethal, btu the concentration must remain at that level for the duration of time.

In open winded areas, this is almost impossible to occur.

AND, if the Chloro Picrin was present, you would not be able to breath anywhere near the wagons.

Your statements and posts on Chloropicrin are most certainly interesting, Kiwichap. Assuming there was Chloropicrin in the Zyklon-B allegedly used for mass gassings, let us try to calculate how much would reach the victims.

You quote an unidentified source which states:

Inhalation exposure to 4 ppm (26 mg/meters cubed) for a few seconds may cause some degree of incapacitation (5) and an exposure of a few seconds to 15 ppm (100 mg/meters cubed) can cause injury to the respiratory track. Exposure to concentrations above 15 ppm can result in lacrimation, vomiting, and if allowed to continue for a minute or longer, can cause pulmonary edema and possibly death.

"Some Aspects of Ship Fumigation" from U.S. Public Health Reports, Vol. 46, No. 27, July 3, 1931 written by the US surgeon general for US public health wrote:

Zyklon-B is liquid hydrocyanic acid absorbed by an earthy substance called "diatomite" and packed in strong tin containers. Cans are provided containing 15 grams, 120 grams, 480 grams, and 1,200 grams of hydrocyanic acid with 5 per cent chloropicrin as a warning gas. The cans at present are packed with a slight vacuum, which is shown by dents or sinking in of the sides of the cans.
http://codoh.com/incon/inconusphr.html

So 5% of all Zyklon-B that would be outgassed would contain chloropicrin. Assuming a bare minimum of 300 ppm of HCN used to kill the victims (although needed to be much higher to meet quick gassing times attested to be witnesses), thats 15 ppm of chloropicrin.

Your unidentified source suggests serious problems would be affecting the victims upon such a concentration. In addition to non-stop caughing and eye-burning, there would be some degree of incapacitation, injury to their respiratory track, and possibly occurences of lacrimation and vomiting.

Obviously, under such conditions, the victims would not be screaming for minutes as "eye-witnesses" so allege, for their throats would be too incapacitated attempting to remove the indicator to allow for it.

[Kiwichap]

Here are the references.

U.S Department of Labor
Occupational Safety and Health Administration

2. Effects on Humans: Hydrogen cyanide can cause rapid death due to metabolic asphyxiation. Death can occur within seconds or minutes of the inhalation of high concentrations of hydrogen cyanide gas. A recent study reports an estimated LC(50) in humans of 3,404 ppm for a 1-minute exposure; other sources report that 270 ppm is fatal after 6 to 8 minutes, 181 ppm after 10 minutes and 135 ppm after 30 minutes [Hathaway et al. 1991].

http://www.osha.gov/SLTC/healthguidelin ... uresources


Chloropicrin

Acute Toxicity
Undiluted chloropicrin is highly toxic by ingestion or direct contact with the skin or eyes. According to the American Conference of Governmental Industrial Hygienists (5), airborne exposure to 0.3-0.37 ppm (2-2.5 mg/meters cubed) for 3-30 seconds results in eye irritation. This response is reported to be highly variable among individuals and tearing (lachrymation) may occur at airborne exposures of 0.15-0.3 ppm (1-2 mg/meters cubed) (5). Inhalation exposure to 4 ppm (26 mg/meters cubed) for a few seconds may cause some degree of incapacitation (5) and an exposure of a few seconds to 15 ppm (100 mg/meters cubed) can cause injury to the respiratory track. Exposure to concentrations above 15 ppm can result in lacrimation, vomiting, and if allowed to continue for a minute or longer, can cause pulmonary edema and possibly death (5)

http://pmep.cce.cornell.edu/profiles/ex ... n-ext.html

Chloropicrin, Chlorine, Mustard Gas and Phosgene were the gasses of choice in WW1. They are known as pulmonary agents (or choking agent) They are chemical weapons designed to impede a victim's ability to breathe, resulting in suffocation.

It makes sense to me to add to a lethal gas if breathed, another lethal gas to stop you breathing. I believe Degesh had the patent for adding chloropicrin to hydrogen cyanide.

[Kiwichap]

You cannot drive a train with wagons exposed to HCN anywhere. Wahrheit. Why not?

Well there are many reasons apart from total irresponsibility, not least a mechanical failure of the train. You are probably thinking of a train merrily travelling along with a nice breeze airing off the cyanide. Trains don't always move like that, they sit for long periods at signals, crossings, shunting, etc etc. They pass through stations, towns and cities. How about the poor Guard in his van, the last wagon, he would cop the lot. Some passengers usually ride in the Guards van also.

But it is all a moot point as it never happened. The facilities shown by Berg look pretty impressive to me. The wagons would have been totally ventilated safely before leaving the facility. Of course, if thousands of Jews, shut up in box wagons, saturated with HCN... on a still, cold day.... Lethal!

[Friedrich Paul Berg]

The venting that I suggested as a possible safety measure AFTER a thorough venting inside the tunnels would have only been needed for trace residues of cyanide in or among the corpses.

The same applied to blankets, for example. There was at least one incident where some blankets had been fumigated and ventilated in a Kreislauf gas chamber--but when some people covered themselves with some of those blankets, they did not wake up next day. Apparently, small but lethal quantities of cyanide continued to leave the blankets over several hours and killed the persons in close contact with those blankets. For that reason, fumigated objects including clothing were given additional airing in the open a-f-t-e-r the normal fumigation and venting inside Kreislauf chambers.

The picture above was taken shortly after “liberation” by the Americans and shows the purpose of real German gas chambers–to delouse clothing and nothing more sinister than that. The four Zyklon-B delousing chambers are directly behind the covered walkway behind the clothing. The USHM caption admits as much: “Two American soldiers examine disinfected prisoner uniforms in Dachau.” However the USHM goes on to insist as their caption continues that these articles of clothing were from dead prisoners and were simply being cleaned before being redistributed. Some of the clothing may indeed have been from dead prisoners but periodic delousing of clothing was the normal procedure for everyone's clothing at Dachau and every other military camp (POW or German military) in Germany as well. Shame on the USHM.

Nothing like the intimate contact between a person sleeping for hours under a disinfected blanket would have been needed by people simply removing corpses with gloves from reasonably well-ventilated cattle cars.

Friedrich Paul Berg
Learn everything at www.nazigassings.com
Nazi Gassings Never Happened! Niemand wurde vergast!

[Friedrich Paul Berg]

Just a few minutes ago, I received the following translation of the e-mail from Robert Faurisson which I included, in French, in the post with which I began this thread.

Dear Sir,

The argument of Fritz Berg has no value at all. I have told him that to
his face. But maybe you are familiar with this unfortunate man's temper
and zeal.

The existence of these hangars for the disinfection of trains was known
for a long time, and I recall having talked about this during my first
visit to the United States in 1979. Among my photo slides, in
particular, I had some about a shed for the disinfection of trains (in
Budapest?). I have repeated a hundred times, that gassing of inanimate
objects, such as clothing, boats, trains, or facilities as sheds,
churches, silos, libraries, rooms, etc. would truly be a delicate and
dangerous, but not an impossible, operation. It would suffice to take a
certain number of precautions, (for example, in order to avoid the
spreading of the gas to the outside, explosions, etc.) and to proceed
with the aeration, the ventilation of the inanimate objects at the
gassing site wherein the gas could still remain. I have written of these
procedures.

On the other hand, when the subject is alive, the problem becomes
formidable, because the body is entirely impregnated and permeated with a virulent poison. It is for this reason that an execution gas chamber is so complicated, and that is why the doctor and his two assistants have to
multiply the precautions. I will not reiterate about all they have to do
and which does not guarantee much, because even after all that, the
corpse to be removed from the chamber, can still be hazardous. One can
well imagine the formidable dangers which the piles of corpses would
constitute, be they inside a shed, a house, or a so-called Nazi "gas
chamber". There is the rub. Here lies the danger and nowhere else. One
ends up with a practical, total impossibility. As to my question of
1978: For me, the mass gassings are technically impossible, yet you, if
you think, that this is technically possible, show it to me. You know
the answer which you gave me on February 21, 1979: A jest and an
admission of incapacity? And since that date I am still waiting for an
answer, be it from any practical jokers, or be it from Mr. Berg.

That which the latter could never stand, that a Frenchman, imbued in the
culture of classical literature, had made a kind of scientific discovery,
which a German or, better yet, especially, an American chemist or
engineer should have attained, because, in the United States, gas chamber facilities were present right there within their penitentiaries.

As to that, I remember that in 1917 American humanitarians had the idea
that it would be easier and more humane to execute the condemned persons with gas, than with the electric chair, or hanging, or by firing squad. That's when in the course of the construction of a gas chamber the
technical difficulties were discovered. After seven years worth of
effort, the first execution took place in Carson City, Nevada, which
turned out to be all but a complete catastrophe.

What would Mr. F. Berg have done, had it been demanded of him to enter
his shed, immediately, or some hours later after an execution in order to
remove thousands of corpses, highly impermeated with cyanide, and
therefore untouchable? I had put this question to him in public, and he
remained silent. I have told him, "study a subject that you have never
studied: About the execution gas chambers in your own country." I
remember that an American, who had followed our conversation had then
made the remark, "Well, there, at least this is clear!"

Regards,

RF

It is sad to say but it has to be said, the above letter from one of the icons of holocaust revisionism shows that he has no better grasp of the subject matter than he had nearly twenty-five years ago.

It is already quite late in the day and I will have more to say tomorrow, but very quickly regarding the questions Faurisson puts to me in his last paragraph--the partial answers are rather obvious. There would be no reason to enter a railroad car filled with corpses shortly after a gassing since the standard operating procedure would have also included about an hour of thorough venting of the entire railroad car (or cars) with fresh, warmed air. The venting process included a large blower and properly placed and sized ductwork to achieve thorough venting. After that, if I or anyone entered, we would be wearing rubber gloves--and even gas masks if it seemed necessary. Every German soldier and most, if not all, civilians had gas masks with interchangeable filters which could have certainly been used for removing corpses also.

Is this too hard for anyone to understand? Am I losing anyone? No doubt, Faurisson will not get it and never will. I explained this all to him many years ago in person and in 1994 with my answer to his foolish nine-word challenge "Show me or draw me a Nazi gas chamber"---but he has forgotten everything and learned nothing.

Friedrich Paul Berg
Learn everything at www.nazigassings.com
Nazi Gassings Never Happened! Niemand wurde vergast!

[MrNobody]

Are you sure Germans transported stock in box cars?

Yes, When transporting a Cav unit the standard practice was to load 8 Horses & Handlers or 40 Troopers per boxcar.
Even the Cavalry's support elements (or other units Horse Drawn elements) were entrained, although with such items as field kitchen, Munitions wagons, Ambulances & Gun limbers flat cars were used for load/unloading convenience.
For the Russian Campaign the Germans used 3 Million Horses, you don't really believe they rode all the way to Moscow (some 1600km) do you?

Thats an interesting picture you have of a box car with the door at one end of the wagon. You won't see that on the Auschwitz Album wagons. In fact, I have never ever seen one. Common sense dictates the doors are ALWAYS in the centre of the wagon to facilitate loading and unloading. Perhaps it was custom built for a special job.

We can't always base our experiences on where & when we are, particularly when you're in the Southern Hemisphere.


Poles being forcibly transported by Russia to Siberia (1940)

[MrNobody]

Thats an interesting picture you have of a box car with the door at one end of the wagon. You won't see that on the Auschwitz Album wagons. In fact, I have never ever seen one. Common sense dictates the doors are ALWAYS in the centre of the wagon to facilitate loading and unloading. Perhaps it was custom built for a special job.

You've got to get rid of those preconceived notions.

First consider that Germany employed any Train, Wagon, Boxcar that met the German-Polish rail gauge.

Second you assumed it was the only door on the boxcar.

Third you assumed that there was only 1 type of boxcar, despite the multitude of countries & manufacturers.

The Chicago Holocaust Museum, Illinois


Vad Yashem


Jews from Carpathian Ruthenia get off the deportation train and assemble on the ramp at Auschwitz-Birkenau. [Photograph credit: United States Holocaust Museum, courtesy of Yad Vashem]

[Wahrheit]

Is this too hard for anyone to understand? Am I losing anyone? No doubt, Faurisson will not get it and never will. I explained this all to him many years ago in person and in 1994 with my answer to his foolish nine-word challenge "Show me or draw me a Nazi gas chamber"---but he has forgotten everything and learned nothing.

It is unlikely for anything to meet Faurisson's standards. He has been shown, and even discussed to audiences himself, these Nazi gas chambers.

Faurisson's objection isn't over whether these facilities could murder millions with poisonous gas, as they most certainly could. Instead, Faurisson's objection is for these facilities to work in an employee safe and friendly manner.

Given the timeperiod, and given what acts we are hypothesizing would occur, what irony that Faurrisson demands worker safety, which BTW could easily be provided through special suits, gloves, gas masks, slave labor, etc...

[Kiwichap]

C'mon Mr Nobody, you show more photos detailing exactly what I said. The door is in the center, always. Let me repeat that, ALWAYS! The wagons seem to have some planks removed for ventilation. They are not doors. The wagons in the Auschwitz photos, and the ones you have supplied, are all standard box wagons with doors in the center. Sure, there may be some non standard, custom built wagons, but they are few and far between. And I would not count eight horses of a cavalry unit as stock. Horses are probably the only animal to get special treatment when travelling, and elephants I guess.

As far as gasmasks are concerned. Chlorpicrin was added to phosgene as a war gas because it penetrates gas masks. The idea was to get the victim to throw off the gas mask. Chloropicrin has an IMMEDIATE effect, before any other gas. It is also the most irritant of the war gasses.

If the Germans wanted to kill people they just needed a little bit of Chloropicrin. Why waste money on cyanide, its not going to have any effect.

Some folk do not understand how deadly cyanide and chloropicrin are. They think it dissipates and dilutes in the air. NOT so. A cloud of chloropicrin travelled a quarter mile and put 250 folk in hospital. 150 agriculture workers got sick two days after a spraying because chloropicrin hung around close to the ground. It all depends on weather conditions and NOBODY is going to take any risks. Cyanide remained in the blankets. You can ventilate all you like but if the temperature is right, the cyanide stays as liquid form in clothing, mattresses etc. Its deadly stuff and must be treated with the utmost respect. Leuchter understood this and made his judgement before even looking at the scientific data results.

[Friedrich Paul Berg]

What follows immediately below is a brief note that someone sent me in response to my earlier response to Faurisson:

So you are saying, in a nutshell, that the Germans had, of course, the small delousing chambers for clothing at the camps and also big hangars to delouse trains.

The simple answer to the note above is--of course! Faurisson's fanatical insistence that the German delousing gaschambers could not possibly have worked for mass murder is simply INSANE!

That is a harsh thing to say about the arguments of the holocaust revisionist icon--but, it should be said because it is true. For more than twenty years, Faurisson has lost, as far as I know, one court case after another (perhaps every case)--and, no doubt, with good reason. He is a techno-idiot who cannot grasp the most basic kinds of scientific or technical arguments or evidence. But then, to make matters even much worse--he goes out of his way again and again to stab people in the back (as he has with his email to you about me) who understand the issues quite well--and who have perfectly valid, and reasonable, and easily comprehensible arguments against the holocaust hoax. He makes the entire revisionist movement look ridiculous with his absolute incompetence. He is a kind of Pied Piper. His true believing followers continue to worship him, no matter what happens--but the rest of the world thinks he is nuts.

Whatever problems might arise during the venting phase of any of the German gaschambers, they are corrected easily enough by either lengthening the forced venting phase and/or by raising the temperature of the circulating fresh air. Those things are childishly easily to change once one has a properly designed and constructed gas chamber as all of the German Kreislauf gaschambers were. Instead of venting for one hour, one can vent for 1-1/2 hours--or even longer. Instead of forcing fresh air throughout the chamber at a temperature of 90 degrees Fahrenheit, one can raise the temperature to 100 degrees instead--or even higher. Cyanide BOILS at only 79.6 degrees Fahrenheit (just a few degrees above room temperature) so that should more than take care of any venting problems. One would not do that in an Amercan execution procedure because the higher temperatures would be seen as "cruel and unusual" or even as "torture." But, for venting dead corpses of Jews in Nazi Germany--it would have certainly worked, and quite easily.

Let Faurisson respond, if he even dares, to what I have just written. Let him respond, if he even dares, to what I wrote in my answer to his foolish nine-word challenge in 1994. He certainly saw my public answer to his nine-word challenge (which Mark Weber tried to suppress, by the way) in 1994. Faurisson's claim to you that at sometime in the past, I had had NO answer in public to his arguments is simply a LIE!

Friedrich Paul Berg
Learn everything at wwqw.nazigassings.com
Nazi Gassings Never Happened! Niemand wurde vergast!

PS Kiwichap has provided some valuable insight into some of the problems of railroads--but, he is mistaken when he claims that cyanide could NOT be vented simply with fresh air. Fresh air natural venting (without any blowers) was the standard procedure for venting many hundreds of thousands of barracks buildings throughout German-occupied Europe as well as clothing that had been deloused with cyanide in makeshift gaschambers. The time needed for such natural venting was about 24 hours.

The fact that cyanide did vent naturally was also one of the reasons for why HCN was ideal for fumigations. Furthermore, after thorough venting there was NO trace residue. Other fumigants left residues which were, as in the case of methyl bromide used widely by the US army, also carcinogenic. Cyanide was totally safe in that respect.

FPB

[Kiwichap]

Mr Berg, I am not sure what your argument is with Faurisson, and I'm not sure what you are arguing here.

Is your argument - 'If the Germans wanted to gas folk, they could have gassed them more easily than in gas chambers, by just gassing the train loads of folk in transit'. Therefore, gas chambers are ridiculous? Is all this talk about railway gassing a strategy to show the plausibility of extermination, and then prove it never happened? I just don't quite get it.

Anyway, I have to agree with Faurisson. On the other hand, when the subject is alive, the problem becomes formidable, because the body is entirely impregnated and permeated with a virulent poison. It is for this reason that an execution gas chamber is so complicated... One can well imagine the formidable dangers which the piles of corpses would constitute, be they inside a shed, a house, or a so-called Nazi "gas chamber".

It would be even worse in a box car with only a few boards removed. Hundreds of clothed corpses, fallen all over one another. There is no possibility of ventilating that. Its ridiculous to even think you could ventilate it. This is not a barrack or a dining room. This is a pile of cyanide soaked clothing & corpses. Cyanide, boiling point, 26 °C (78.8 °F). In winter and on cold days, underneath the corpses the cyanide would be liquid again. Soaked, even if damply into clothing. The chamber would need to be oven temperature for some time to make sure you got it all. Nobody gets a second chance with cyanide. And we won't even go into the 5% chemical warfare weapon added into the mix (as a safety measure for humans).

[Wahrheit]

It would be even worse in a box car with only a few boards removed. Hundreds of clothed corpses, fallen all over one another. There is no possibility of ventilating that. Its ridiculous to even think you could ventilate it. This is not a barrack or a dining room. This is a pile of cyanide soaked clothing & corpses. Cyanide, boiling point, 26 °C (78.8 °F). In winter and on cold days, underneath the corpses the cyanide would be liquid again. Soaked, even if damply into clothing.

Kiwichap, it's just not credible logic. While hydrogen cyanide is dangerous, had everything you write above been true (that it would remain in the chamber, and be absorbed by the skin of people entering the chamber), it would not be used as a fumigant by anyone. Instead we are aware that it was used many thousands of times to cleanse objects of vermin.

Indeed, if what you write above is true, millions of people would be dead from the delousings, for the cyanide saturated clothes and other objects would kill off those handling the items, yet this is not the case.

As Mr. Berg has written in a response to Faurisson,

Cyanide Absorption through the Skin
Faurisson's claims that for mass murder oceans of hydrocyanic acid" would have been required and that the corpses as well as the chambers would have been saturated" with HCN are pure fantasy! He is apparently unaware of the meaning of the word saturate" and of the fact that the amount of HCN needed to kill someone is less than one gram whereas the amount needed to saturate" a corpse is at least a thousand times greater. Practically all of the lethal dosage of HCN would enter through the lungs and not the skin.

Faurisson has repeatedly overstated the danger of HCN absorption through the skin. Although skin certainly does absorb HCN, it does so rather slowly. According to a source which Faurisson has himself used, 10 minutes are required to overcome a man with a gas mask whose skin is exposed to a concentration of 2% HCN in air.

“(2) It should also be remembered that a man may be overcome by the absorption of hydrocyanic acid gas through the skin; a concentration of 2 percent hydrocyanic acid being sufficient to thus overcome a man in about 10 minutes. Therefore, even if one wears a gas mask, exposure to concentrations of hydrocyanic acid gas of 1 percent by volume or greater should be made only in case of necessity and then for a period not longer than 1 minute at a time. In general, places containing this gas should be well ventilated with fresh air before the wearer of the mask enters, thus reducing the concentration of hydrocyanic acid gas to low fractional percentages.” (See: The Gas Mask, Technical Manual No. 3-205, War Department, Washington, October 9, 1941, p. 144, NA RG 407, Records of the Adjutant General's Office, 1917 TM 3-205.)

The typical lethal concentration for an execution chamber and for delousing is only 0.1% HCN in air, in other words, the lethal gas need only be one-twentieth as strong as the gas discussed in Faurisson's reference. If one applies a rule of thumb or reciprocity known sometimes as Henderson's Rule, one would need twenty times as long to cause the same toxic effect. In other words, approximately 200 minutes or three hours of exposure to 0.1% HCN would be needed to overcome a worker wearing a gas mask but whose skin is exposed. It is almost inconceivable, however, that workers removing corpses would be exposed to anything near these concentrations after the doors were opened. Depending upon the duration of the forced-venting of the chamber, the cyanide levels confronting workers would be far, far less than 0.1%; that was why, after all, the chambers would have been force-vented in the first place before the doors were opened. The principal danger to workers removing corpses is from cyanide vapors gradually leaving corpses and walls and then mixing with air surrounding the workers. However, with the circulation blowers continuing to bring fresh air into the chambers, the cyanide levels in air would be maintained easily enough at extremely low levels, safe enough for workers wearing rubber gloves to remove corpses without also wearing gas masks. In other words, the danger of HCN absorption through parts of the skin not covered with rubber gloves is negligible in a DEGESCH delousing chamber or tunnel if it is operated correctly.
http://www.nazigassings.com/faurisson.html

And this is assuming that the workers would remove the corpses while exposing bare skin, against common sense.

And we should find out when exactly the chlorpicrin was removed from Zyklon-B during the war for purpsoes of our discussion.