Editing CR gas (section)

==Physical properties and deployment==
CR is a pale yellow crystalline solid with a spicy odor. It is slightly soluble in water and does not degrade in it. CR is usually presented as a microparticulate solid, in the form of [[suspension (chemistry)|suspension]] in a [[propylene glycol]]-based liquid. Contrary to its common name, it is not a gas but a solid at room temperature.

The dibenz[b,f][1,4]oxazepine [[Moiety (chemistry)|moiety]] is present in the [[typical antipsychotic]] [[drug]] [[loxapine]], but, unlike CR, [[loxapine]] is not reactive and is not an irritant. CR was first synthesised in 1962.<ref name="higginbo">{{cite journal| vauthors= Higginbo R, Suschitzky H |title=Synthesis of Heterocyclic Compounds. 2. Cyclisation of O-Nitrophenyl Oxygen Ethers|journal=[[J. Chem. Soc.]] |year=1962|pages=2367–2370| doi= 10.1039/jr9620002367}}</ref>

CR can be delivered either as an aerosol or a solution in water, making it able to be used in water cannons, smoke grenades, or handheld spray cans. For smoke it is usually fired in canisters (LACR) that heat up, producing an [[aerosol]] cloud at a steady rate.