Mustard gas, though technically not a gas and often called sulfur mustard by scholarly sources, is the prototypical substance of the sulfur-based family of cytotoxic
and vesicant chemical warfare agent
s, which can form large blister
s on exposed skin and in the lungs. It has a history of use as a blister-agent in warfare and, along with organoarsenic compound
s such as Lewisite
, is the most well-studied of such agents. Related chemical compounds with similar chemical structure and similar properties form a class of compounds known collectively as sulfur mustards or mustard agents. Pure sulfur mustards are colorless, viscous liquids at room temperature. When used in impure form, such as warfare agents, they are usually yellow-brown
and have an odor resembling mustard plant
, or horseradish
, hence the name. The common name of "mustard gas" is inaccurate because the sulfur mustard is not actually vaporized, but dispersed as a fine mist of liquid droplets. Mustard gas was originally assigned the name LOST, after the scientists Wilhelm Lommel and Wilhelm Steinkopf
, who developed a method of large-scale production for the Imperial German Army
Mustard agents are regulated under the 1993 Chemical Weapons Convention
. Three classes of chemicals are monitored under this Convention, with sulfur and nitrogen mustard
grouped in Schedule 1
, as substances with no use other than in chemical warfare
(though since then, mustard gas has been found to be useful in cancer chemotherapy
). Mustard agents could be deployed by means of artillery shell
s, aerial bomb
s, or by spraying from warplane
s or other aircraft.
Mustard gas can be readily decontaminated through reaction with chloramine-T
Sulfur mustard (SM) is a potent chemical warfare agent that was widely used during the First World War and the Iran–Iraq conflict.
Synthesis and reactions
Mustard gas is the organic compound
S. In the Depretz method, mustard gas is synthesized by treating sulfur dichloride
+ 2 C2
In the Levinstein process, disulfur dichloride
is used instead:
: 8 S2
+ 16 C2
→ 8 (ClCH2
S + S8
In the Meyer method, thiodiglycol
is produced from chloroethanol
and potassium sulfide
and chlorinated with phosphorus trichloride
: 3 (HOCH2
S + 2 PCl3
→ 3 (ClCH2
S + 2 P(OH)3
In the Meyer-Clarke method, concentrated hydrochloric acid
(HCl) instead of PCl3
is used as the chlorinating agent:
S + 2 HCl → (ClCH2
S + 2 H2
, the latter of which (CG) is also a choking agent
, have also been used as chlorinating agents, with the added possibility of both agents producing additional mechanisms of toxicity if they remain as impurities in the finished product.
Mustard gas is a viscous liquid at normal temperatures. The pure compound has a melting point of and decomposes before boiling at .
Reaction of mustard gas with sodium ethoxide gives divinyl sulfide
S + 2 NaOEt → (CH2
S + 2 EtOH + 2 NaCl
Mechanism of cellular toxicity
The compound readily eliminates a chloride
ion by intramolecular nucleophilic substitution
to form a cyclic sulfonium
ion. This very reactive intermediate tends to cause permanent alkylation
of the guanine nucleotide
strands, which prevents cellular division and generally leads directly to programmed cell death
[Mustard agents: description, physical and chemical properties, mechanism of action, symptoms, antidotes and methods of treatment](_blank)
Organisation for the Prohibition of Chemical Weapons. Accessed June 8, 2010.
or, if cell death is not immediate, the damaged DNA may lead to the development of cancer.
would be another pathology involved in mustard gas toxicity. Mustard gas is not very soluble in water but is very soluble in fat, contributing to its rapid absorption into the skin.
In the wider sense, compounds with the structural element BCH2
X, where X is any leaving group
and B is a Lewis base
are known as ''mustards''. Such compounds can form cyclic "onium" ions (sulfonium, ammonium
s, etc.) that are good alkylating agent
s. Examples are bis(2-chloroethyl)ether, the (2-haloethyl)amines (nitrogen mustard
s), and sulfur sesquimustard, which has two α-chloroethyl thioether groups (ClH2
S−) connected by an ethylene (−CH2
−) group. These compounds have a similar ability to alkylate DNA, but their physical properties, e.g. melting points, may vary.
showing characteristic bullae
on neck, armpit and hands
Mustard agent has extremely powerful vesicant
(blistering) effects on its victims. In addition, it is strongly mutagen
ic and carcinogen
ic, due to its alkylating properties. It is also lipophilic
. Because people exposed to mustard agent rarely suffer immediate symptoms, and mustard-contaminated areas may appear completely normal, victims can unknowingly receive high dosages. Within 24 hours of exposure to mustard agent, victims experience intense itching and skin irritation, which gradually turns into large blisters filled with yellow fluid wherever the mustard agent contacted the skin. These are chemical burn
s and are very debilitating. Mustard agent vapor easily penetrates clothing fabrics such as wool or cotton, so it is not only the exposed skin of victims that gets burned. If the victim's eyes were exposed then they become sore, starting with conjunctivitis
(also known as pink eye), after which the eyelids swell, resulting in temporary blindness. In rare cases of extreme ocular exposure to mustard gas vapors, corneal ulceration, anterior chamber scarring, and neovascularization
have occurred. In these severe and infrequent cases, corneal transplantation has been used as a treatment option. Miosis
, when the pupil constricts more than usual, may also occur, which is probably the result of the cholinomimetic activity of mustard. At very high concentrations, if inhaled, mustard agent causes bleeding and blistering within the respiratory system
, damaging mucous membrane
s and causing pulmonary edema
. Depending on the level of contamination, mustard agent burns can vary between first
and second degree burn
s, though they can also be every bit as severe, disfiguring and dangerous as third degree burn
s. Severe mustard agent burns (i.e. where more than 50% of the victim's skin has been burned) are often fatal, with death occurring after days or even weeks have passed. Mild or moderate exposure to mustard agent is unlikely to kill, though victims require lengthy periods of medical treatment and convalescence
before recovery is complete.
effects of mustard agent mean that victims who recover from mustard agent burns have an increased risk of developing cancer
in later life. In a study of patients 25 years after wartime exposure to chemical weaponry, c-DNA microarray profiling indicated that 122 genes were significantly mutated in the lungs and airways of mustard gas victims. Those genes all correspond to functions commonly affected by mustard gas exposure, including apoptosis
, inflammation, and stress responses.
on arm caused by blister agent
The vesicant property of mustard agent can be neutralized by oxidation
, using household bleach (sodium hypochlorite
), or by nucleophilic attack using e.g. decontamination solution "DS2" (2% NaOH
, 70% diethylenetriamine
, 28% 2-methoxyethanol
). After initial decontamination of the victim's wounds is complete, medical treatment is similar to that required by any conventional burn. The degree of pain and discomfort suffered by the victim is also comparable. Mustard agent burns heal slowly, and, as with other types of burn, present a risk of sepsis
caused by pathogen
s such as ''Staphylococcus aureus
'' and ''Pseudomonas aeruginosa
''. The mechanisms behind mustard gas's effect on endothelial cells are still being studied, but recent studies have shown that high levels of exposure can induce high rates of both necrosis
. In vitro tests have shown that at low concentrations of mustard gas, where apoptosis is the predominant result of exposure, pretreatment with 50 mM N-acetyl-L-cysteine
(NAC) was able to decrease the rate of apoptosis. NAC protects actin
filaments from reorganization by mustard gas, demonstrating that actin filaments play a large role in the severe burns observed in victims.
A British nurse treating soldiers with mustard agent burns during World War I
In its history, various types and mixtures of mustard gas have been employed. These include:
* H – Also known as HS ("Hun Stuff") or ''Levinstein mustard''. This is named after the inventor of the quick but dirty Levinstein Process for manufacture,
reacting dry ethylene
with sulfur monochloride
under controlled conditions. Undistilled mustard gas contains 20–30% impurities, for which reason it does not store as well as HD. Also, as it decomposes, it increases in vapor pressure
, making the munition it is contained in likely to split, especially along a seam, releasing the agent to the atmosphere
* HD – Codenamed Pyro by the British, and Distilled Mustard by the US.
sulfur mustard (bis(2-chloroethyl) sulfide); approximately 96% pure. The term "mustard gas" usually refers to this variety of sulfur mustard. A much-used path of synthesis was based upon the reaction of thiodiglycol
with hydrochloric acid
* HT – Codenamed Runcol by the British, and Mustard T- mixture by the US.
A mixture of 60% mustard gas (HD) and 40% T (bis-(2-chloroethylthio)ethyl
ether), a related vesicant with lower freezing point
, lower volatility
and similar vesicant characteristics.
* HL – A blend of distilled mustard (HD) and Lewisite
(L), originally intended for use in winter conditions due to its lower freezing point compared to the pure substances. The Lewisite component of HL was used as a form of antifreeze
* HQ – A blend of distilled mustard (HD) and sesquimustard (Q) (Gates and Moore 1946).
Mustard gas agents (class)
The complete list of effective mustard gas agents commonly stockpiled is as follows:
Mustard agent was possibly developed as early as 1822 by César-Mansuète Despretz
[By Any Other Name: Origins of Mustard Gas](_blank)
. Itech.dickinson.edu (2008-04-25). Retrieved on 2011-05-29.
Despretz described the reaction of sulfur dichloride
but never made mention of any irritating properties of the reaction product. In 1854, another French chemist, Alfred Riche (1829–1908), repeated this procedure, also without describing any adverse physiological properties. In 1860, the British scientist Frederick Guthrie
synthesized and characterized the mustard agent compound and noted its irritating properties, especially in tasting.
Also in 1860, chemist Albert Niemann
, known as a pioneer in cocaine
chemistry, repeated the reaction, and recorded blister-forming properties. In 1886, Viktor Meyer
published a paper describing a synthesis that produced good yields. He combined 2-chloroethanol
with aqueous potassium sulfide
, and then treated the resulting thiodiglycol
with phosphorus trichloride
. The purity of this compound was much higher and consequently the adverse health effects upon exposure were much more severe. These symptoms presented themselves in his assistant, and in order to rule out the possibility that his assistant was suffering from a mental illness (psychosomatic symptoms), Meyer had this compound tested on laboratory rabbit
s, most of which died. In 1913, the English chemist Hans Thacher Clarke
(known for the Eschweiler-Clarke reaction
) replaced the phosphorus trichloride with hydrochloric acid
in Meyer's formulation while working with Emil Fischer
. Clarke was hospitalized for two months for burns after one of his flasks broke. According to Meyer, Fischer's report on this accident to the German Chemical Society
sent the German Empire
on the road to chemical weapons.
Mustard agent can have the effect of turning a patient's skin different colors, including reds, oranges, pinks, and in unusual cases, blues. The German Empire
during World War I
relied on the Meyer-Clarke method because 2-chloroethanol
was readily available from the German dye industry of that time.
Pallets of 155 mm Pueblo_chemical_weapons_storage_facility
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Mustard agent was first used effectively in World War I
by the German army against British and Canadian soldiers near Ypres
, Belgium, in 1917 and later also against the French Second Army
. The name ''Yperite'' comes from its usage by the German army near the town of Ypres. The Allies did not use mustard agent until November 1917 at Cambrai
, France, after the armies had captured a stockpile of German mustard shells. It took the British more than a year to develop their own mustard agent weapon, with production of the chemicals centred on Avonmouth Docks
(the only option available to the British was the Despretz–Niemann–Guthrie process). This was used first in September 1918 during the breaking of the Hindenburg Line
Mustard agent was dispersed as an aerosol
in a mixture with other chemicals, giving it a yellow-brown color and a distinctive odor. Mustard agent has also been dispersed in such munitions as aerial bomb
s, land mine
s, mortar rounds
, artillery shell
s, and rocket
Exposure to mustard agent was lethal in about 1% of cases. Its effectiveness was as an incapacitating agent
. The early countermeasures against mustard agent were relatively ineffective, since a soldier wearing a gas mask
was not protected against absorbing it through his skin and being blistered. The effectiveness of using a urine-soaked mask or facecloth to prevent or reduce injury, a common anecdotal field-expedient remedy attested by soldiers in documentaries e.g. They Shall Not Grow Old in 2018 and others (such as forward aid nurses) interviewed between 1947 and 1981 by the British Broadcasting Corporation for various World War One history programs on being gassed remains unclear.
Mustard agent is a persistent weapon that remains on the ground for weeks, and it continues to cause ill effects. If mustard agent contaminates a soldier's clothing and equipment while cold, then the other soldiers or nurses with whom they share an enclosed space could become poisoned as contaminated items warms up enough to become an airborne toxic agent, and an example of this was depicted in a British and Canadian documentary about life in the trenches particularly once the "sousterrain" (subways and berthing areas underground) were completed in Belgium and France. Towards the end of World War I, mustard agent was used in high concentrations as an area-denial weapon
that forced troops to abandon heavily contaminated areas.
Since World War I, mustard agent has been used in several wars and other conflicts, usually against people who cannot retaliate in kind:
[Blister Agent: Mustard gas (H, HD, HS)](_blank)
* United Kingdom against the Red Army
against the Rifian
resistance in Morocco
* The Soviet Union
, Republic of China
, during the Soviet Invasion of Xinjiang
against the 36th Division (National Revolutionary Army)
in 1934, and also in the Xinjiang War (1937)
* Italy against Abyssinia
) from 1935 to 1940
* The Japanese Empire
* The 2 December 1943 air raid on Bari
destroyed an Allied stockpile of mustard gas on the SS ''John Harvey''
* Egypt against North Yemen
* Iraq against Kurds
in the town of Halabja
during the Halabja chemical attack
* Iraq against Iranians in 1983–1988
* Possibly in Sudan against insurgents in the civil war
, in 1995 and 1997.
* In the Iraq War
, abandoned stockpiles of mustard gas shells were destroyed in the open air, and were used against Coalition forces in roadside bomb
* By ISIS
forces against Kurdish
forces in Iraq in August 2015.
* By ISIS against another rebel group in the town of Mare'
* According to Syrian State media, by ISIS against Syrian Army during the battle in Deir ez-Zor
In 1943, during the Second World War, an American shipment of mustard agent exploded aboard a supply ship
that was bombed during an air raid
in the harbor of Bari
, Italy. Eighty-three of the 628 hospitalized victims who had been exposed to the mustard agent died.
After WWII, stockpiled mustard agent was dumped by the British in the sea near Port Elizabeth
, South Africa, resulting in burn cases among trawler crews.
The use of toxic gases or other chemicals, including mustard agent, during warfare is known as chemical warfare
, and this kind of warfare was prohibited by the Geneva Protocol of 1925
, and also by the later Chemical Weapons Convention of 1993
. The latter agreement also prohibits the development, production, stockpiling, and sale of such weapons.
In September 2012 a US official stated that the rebel militant group ISIS
was manufacturing and using mustard gas in Syria and Iraq, which was allegedly confirmed by the group's head of chemical weapons development, Sleiman Daoud al-Afari, who has since been captured.
Development of the first chemotherapy drug
As early as 1919 it was known that mustard agent was a suppressor of hematopoiesis
. In addition, autopsies performed on 75 soldiers who had died of mustard agent during World War I
were done by researchers from the University of Pennsylvania
who reported decreased counts of white blood cell
This led the American Office of Scientific Research and Development (OSRD) to finance the biology and chemistry departments at Yale University
to conduct research on the use of chemical warfare during World War II.
As a part of this effort, the group investigated nitrogen mustard
as a therapy for Hodgkin's lymphoma
and other types of lymphoma
, and this compound was tried out on its first human patient in December 1942. The results of this study were not published until 1946, when they were declassified.
In a parallel track, after the air raid on Bari
in December 1943, the doctors of the U.S. Army noted that white blood cell counts were reduced in their patients. Some years after World War II was over, the incident in Bari and the work of the Yale University group with nitrogen mustard converged, and this prompted a search for other similar chemical compound
s. Due to its use in previous studies, the nitrogen mustard called "HN2" became the first cancer chemotherapy
(also called chlormethine), to be used.
In the United States, storage and incineration of mustard agent and other poison gases was carried out by the U.S. Army Chemical Materials Agency. Disposal projects at the two remaining American chemical weapons sites, will be carried out at their sites near Richmond, Kentucky
, and Pueblo, Colorado
. Although not yet Declassified, toxicology specialists who dealt with the accidental puncturing of World War I gas stockpiles add that Air Force bases in Colorado have been made available to assist veterans of the 2003 American war with Iraq in which many Marines were exposed to gas as caches of up to . The United Nations definition of a weapon of mass destruction for mustard gas is , typically the Marines and other coalition allies discovered caches of located across a road from caches as multiple memoirs attest. These were discovered by the assistance of host country allies, or through leaks affecting personnel in an area with a weapon and gas cache called an ASP.
New detection techniques are being developed in order to detect the presence of mustard gas and its metabolites. The technology is portable and detects small quantities of the hazardous waste and its oxidized products, which are notorious for harming unsuspecting civilians. The immunochromatographic
assay would eliminate the need for expensive, time-consuming lab tests and enable easy-to-read tests to protect civilians from sulfur-mustard dumping sites.
In 1946, 10,000 drums of mustard gas (2,800 tonnes) stored at the production facility of Stormont Chemicals in Cornwall, Ontario
, Canada were loaded onto 187 boxcars for the journey to be buried at sea on board a long barge south of Sable Island
, southeast of Halifax
at a depth of . The dump location is 42 degrees, 50 minutes north by 60 degrees, 12 minutes west.
A large British stockpile of old mustard agent that had been made and stored since World War I at M. S. Factory, Valley
, Wales, was destroyed in 1958.
Most of the mustard gas agent found in Germany after World War II
was dumped into the Baltic Sea
. Between 1966 and 2002, fishermen have found about 700 chemical weapons in the region of Bornholm
, most of which contain mustard gas. One of the more frequently dumped weapons was the "Sprühbüchse 37" (SprüBü37, Spray Can 37, 1937 being the year of its fielding with the German Army). These weapons contain mustard gas mixed with a thickener
, which gives it a tar-like viscosity. When the content of the SprüBü37 comes in contact with water, only the mustard gas in the outer layers of the lumps of viscous mustard hydrolyzes
, leaving behind amber-colored residues that still contain most of the active mustard gas. On mechanically breaking these lumps, e.g., with the drag board of a fishing net or by the human hand, the enclosed mustard gas is still as active as it had been at the time the weapon was dumped. These lumps, when washed ashore, can be mistaken for amber, which can lead to severe health problems. Artillery shells
containing mustard gas and other toxic ammunition from World War I (as well as conventional explosives) can still be found in France and Belgium. These were formerly disposed of by explosion undersea, but since the current environmental regulations prohibit this, the French government
is building an automated factory to dispose of the accumulation of chemical shells.
In 1972, the U.S. Congress
banned the practice of disposing of chemical weapons into the ocean by the United States. 29,000 tons of nerve and mustard agents had already been dumped into the ocean off the United States by the U.S. Army
. According to a report created in 1998 by William Brankowitz, a deputy project manager in the U.S. Army Chemical Materials Agency
, the army created at least 26 chemical weapons dumping sites in the ocean offshore from at least 11 states on both the East Coast
and the West Coast
(in Operation CHASE
, Operation Geranium
, etc.). In addition, due to poor recordkeeping, about one-half of the sites have only their rough locations known.
In June 1997, India declared its stock of chemical weapons of of mustard gas.
By the end of 2006, India had destroyed more than 75 percent of its chemical weapons/material stockpile and was granted extension for destroying the remaining stocks by April 2009 and was expected to achieve 100 percent destruction within that time frame.
India informed the United Nations in May 2009 that it had destroyed its stockpile of chemical weapons in compliance with the international Chemical Weapons Convention. With this India has become the third country after South Korea and Albania to do so.
This was cross-checked by inspectors of the United Nations.
Producing or stockpiling mustard gas is prohibited by the Chemical Weapons Convention
. When the convention entered force in 1997, the parties declared worldwide stockpiles of 17,440 tonnes of mustard gas. As of December 2015, 86% of these stockpiles had been destroyed.
A significant portion of the stockpile
of mustard agent in the United States was stored at the Edgewood Area of Aberdeen Proving Ground
. Approximately 1,621 tons of mustard agent were stored in one-ton containers on the base under heavy guard. A chemical neutralization plant was built on the proving ground and neutralized the last of this stockpile in February 2005. This stockpile had priority because of the potential for quick reduction of risk to the community. The nearest schools were fitted with overpressurization machinery to protect the students and faculty in the event of a catastrophic explosion and fire at the site. These projects, as well as planning, equipment, and training assistance, were provided to the surrounding community as a part of the Chemical Stockpile Emergency Preparedness Program (CSEPP), a joint program of the Army and the Federal Emergency Management Agency
(FEMA). Unexploded shells containing mustard agent and other chemical agents are still present in several test ranges in proximity to schools in the Edgewood area, but the smaller amounts of poison gas () present considerably lower risks. These remnants are being detected and excavated systematically for disposal. The U.S. Army Chemical Materials Agency oversaw disposal of several other chemical weapons stockpiles located across the United States in compliance with international chemical weapons treaties. These include the complete incineration of the chemical weapons stockpiled in Alabama
, and Oregon
. Earlier, this agency had also completed destruction of the chemical weapons stockpile located on Johnston Atoll
located south of Hawaii
in the Pacific Ocean
. The largest mustard agent stockpile, of about 6,196 ton
s, was stored at the Deseret Chemical Depot
in northern Utah
. The incineration of this stockpile began in 2006. In May 2011, the last one-ton tank of mustard agent was incinerated at the Deseret Chemical Depot, and the last mustard agent artillery shells at Deseret were incinerated in January 2012.
In 2008, many empty mustard agent aerial bomb
s were found in an excavation at the Marrangaroo Army Base
just west of Sydney, Australia.
[Chemical Warfare in Australia](_blank)
Mustardgas.org. Retrieved on 29 May 2011.
In 2009, a mining survey near Chinchilla, Queensland
, uncovered 144 105-millimeter howitzer
shells, some containing "Mustard H", that had been buried by the U.S. Army during World War II.
In 2014, a collection of 200 bombs was found on the boundary between the Flemish
villages of Passendale
. The majority of the bombs were filled with mustard agent. The bombs are a leftover from the German army and were meant to be used in the Battle of Passchendale
in World War I. It was the largest collection of chemical weapons ever found in Belgium.
Post-War accidental exposure
In 2002, an archaeologist at the Presidio Trust archaeology lab in San Francisco was exposed to mustard agent, which had been dug up at the Presidio of San Francisco
, a former military base.
In 2010, a clamming boat pulled up some old artillery
shells of World War I from the Atlantic Ocean
south of Long Island, New York
. Multiple fishermen suffered from skin blistering and respiratory irritation severe enough to require their hospitalization.
WWII-era tests on men
From 1943 to 1944, mustard agent experiments were performed on Australian service volunteers in tropical Queensland, Australia
, by British Army
and American experimenters, resulting in some severe injuries. One test site, the Brook Islands National Park
, was chosen to simulate Pacific islands held by the Imperial Japanese Army
The United States tested mustard gas and other chemical agents including nitrogen mustard
on up to 60,000 servicemen during and after WWII. The experiments were classified secret and as with Agent Orange
, claims for medical care and compensation were routinely denied, even after the WWII-era tests were declassified in 1993. The Department of Veterans Affairs
stated that it would contact 4,000 surviving test subjects but failed to do so, eventually only contacting 600. Skin cancer, severe eczema, leukemia, and chronic breathing problems plagued the test subjects, some of whom were as young as 19 at the time of the tests, until their deaths, but even those who had previously filed claims with the VA went without compensation.
were tested alongside white men in separate trials to determine whether their skin color would afford them a degree of immunity to the agents, and Nisei
servicemen, some of whom had joined after their release from Japanese American Internment Camps
were tested to determine susceptibility of Japanese military personnel
to these agents. These tests also included Puerto-Rican
Detection in biological fluids
Urinary concentrations of the thiodiglycol hydrolysis products of mustard gas have been used to confirm a diagnosis of chemical poisoning in hospitalized victims. The presence in urine of 1,1'-sulfonylbismethylthioethane (SBMTE), a conjugation product with glutathione, is considered a more specific marker, since this metabolite is not found in specimens from unexposed persons. Intact mustard gas was detected in postmortem fluids and tissues of a man who died one week post-exposure.
[R. Baselt, ''Disposition of Toxic Drugs and Chemicals in Man'', 10th edition, Biomedical Publications, Seal Beach, CA, 2014, pp. 1892–1894.]
*Poison gas in World War I
*Yellow Cross (chemical warfare)
Textbook of Military Medicine – Intensive overview of mustard gas
Includes many references to scientific literature
* Shows photographs taken in 1996 showing people with mustard gas burns.
(Caution: contains graphic images)
UMDNJ-Rutgers University CounterACT Research Center of Excellence
A research center studying mustard gas, includesearchable reference library
with many early references on mustard gas.
surgical treatment of mustard gas burnsUK Ministry of Defence Report on disposal of weapons at sea and incidents arisingRhydymwyn Valley History SocietyThe advent of mustard gas in 1917, Simon JonesMeasures to protect against mustard gas, 1917-1918, Simon Jones
Category:World War I chemical weapons
Category:IARC Group 1 carcinogens