VX is O-ethyl S-diisopropylaminomethyl methylphosphonothiolateIt is a brownish liquid substance and its vapours are odourless. The United States began producing it in April 1961, but its composition was not known for another decade. VX is among the most toxic substances known. Mere droplets can kill. It can remain on material and, equipment and terrain for long periods. Uptake is mainly through the skin but also through inhalation of the substance as a gas or aerosol.
 Chemical Weapons



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