OK. So what are Binary Chemical Weapons?
I found this at
http://www.mitretek.org/home.nsf/homelandsecurity/BinaryChemWeapons Binary Chemical Weapons
Binary chemical weapons mix two, separate, relatively non-toxic chemicals in flight to create a toxic chemical agent.
Methylphosphonyl difluoride (DF) is initially located in one canister, while a mixture (OPA) of isopropyl alcohol and isopropyl amine is located in a separate canister. When the weapon is fired (or otherwise delivered), a disk between the canisters ruptures, and the two components react in flight to produce GB.
Methylphosphonyl difluoride (DF) is initially located in one canister, while a mixture of pinacolyl alcohol and an amine is located in a separate canister. When the weapon is fired (or otherwise delivered), a disk between the canisters ruptures, and the two components react in flight to produce GD.
O-Ethyl O-2-diisopropylaminoethyl methylphosphonite (QL) is initially located in one canister, while elemental sulfur is located in a separate canister. When the weapon is fired (or otherwise delivered), a disk between the canisters ruptures, and the two components react in flight to produce VX.