hongcongers have invented two very effective ways of putting out cs canister fires. as follows:
"Since CS gas is propelled out of its canister by a pyrotechnic (fire) explosion, putting out the fire inside is enough to make it stop. There are mainly two relatively safe ways to do this:
The traffic cone method
The principle is simple: cover a canister with a traffic cone to stop the spread of the gas, and use the opening at the top of the cone to pour water in it and put the fire in the canister out. This creative method stops the release of tear gas almost instantly. However, it’s not very efficient when it comes to water use—since you can’t properly aim at the canister inside the cone, you’ll need a lot of water, which is most likely in short supply.
The water bottle technique
Proceed with extreme caution: This method is much more dangerous, since it requires actually handling a hot, detonated tear gas canister or grenade. There are reports of people experiencing second degree burns when coming into direct contact with them. But the Hong Kong protesters figured it out: they used thick, heat-resistant leather gloves to pick up the canisters, put them inside metal water bottles, and shake them thoroughly until the fire in the canister was completely out. For this method, though, protection is key: Exposure to higher concentrations of CS powder make it absolutely necessary to have your eyes and airways thoroughly covered with a gas mask, and wearing appropriate, heat-resistant protection on your hands is a must to avoid burns."
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https://www.popsci.com/story/diy/tear-gas-guide/
Is tear gas flammable?
yes, (cause of some fires which are later blamed on protesters
CS -- the common name for orthochlorbenzalmalononitrile -- is a fine white powder, about the consistency of talcum powder, and it must be spread with some type of dispersing agent. But it has several nasty qualities, including
its flammability.
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https://www.austinchronicle.com/news/2000-07-07/77866/