Mustard-Lewisite mixture Vesicant agents

Vesicant Agents Nitrogen and Sulfur Mustards, Lewisite, and Mustard-Lewisite Mixture... 

Agent HT is generally a mixture of 60% HD and 40% bis(2-chloroethylthioethyl)ether (T), although this ratio may vary. Agent HL is a mixture of sulfur mustard (HD) and lewisite (L) that was developed for cold weather or high-altitude use due to its lower freezing point. Sesqui mustard (Q) is l,2-bis(2-chloroethylthio) ethane and is considered a more potent vesicant than HD but its very low vapor pressure limits its effectiveness as a warfare agent,... 

The freezing point of sulfur mustard has been reduced in a number of ways to prevent the agent from solidifying in weapons in cold weather. In WWI, mustard was mixed with various solvents, e.g. carbon tetrachloride and benzene. In WWII, Britain produced it from thiodiglycol and hydrogen chloride as a 6 4 mixture with the oligomer T (Scheme 1.1), also known as O mustard. T has somewhat greater vesicant activity than sulfur mustard, is less volatile and more persistent. Other nations mixed mustard with lewisite, which also accelerated the onset of effects and increased the vapour hazard. 

Incineration is furthermore applicable to destruction of mixtures of an arsenical agent with another compound, such as another agent, or a polymer added as thickener. In particular, the vesicant Lewisite has sometimes been mixed with yperite or mustard . 

---