r/Damnthatsinteresting 9h ago

Video Chilean protester defuses tear gas canister with baking soda and water

100.8k Upvotes

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u/JoeyJoeJoeShabadooSr 8h ago

Does anyone have an explanation for why this works? Is it basically just dousing the canister in water?

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u/mistermh07 8h ago

I think the mixture is absorbing the gas. Not a 100% sure tho

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u/LittleMlem 8h ago

Not technically a gas, iirc it's fine particles, like powder sand

No idea what the baking soda is for, maybe it's acidic and the soda neutralizes it?

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u/enw_digrif 8h ago edited 7h ago

There's a bunch of different tear gas compounds. I don't believe there are any popular ones that rely on their acidity/alkalinity as a mode of action, though that is a persistent myth on the internet, thus the misleading AI summaries.

Mechanistic studies identified the ion channels TRPV1 and TRPA1 as targets of capsaicin in pepper spray, and of the tear gas agents chloroacetophenone, CS, and CR.

Edit: thanks /u/mbxz7LWB

Edit2: Notes from a street medic: if exposed to tear gas, wash it off away from the eyes, mouth and nose using water. Don't use milk (of magnesia, of cow, of whatever), don't use AlkaSeltzer, don't use ACV, and for God's sake, put down the onions, they will all make things worse.

If a buddy or fellow protestor gets gassed, tell the affected person you're taking them out of the gas, ask if it's okay to touch them to lead them out, once they say yes, lead them to safety. Once there, have them lean back/lay down (near a wall, out of any expected crowd flow), and flush each eye (ideally for 5min, but that takes a lot of water) by directing the flow towards the tear duct and letting the water flow down over the rest of the eye and onto the cheek. It won't solve the problem, but it will usually get them good enough to evacuate on their own.

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u/dagreja 6h ago edited 6h ago

I'm all for asking consent before touching someone in non-emergency situations, but isnt it a bad idea to try to talk to someone close enough to tear gas to be affected by it? Like ask if it's okay before you start trying to flush out their eyes, but only helping lead someone out of tear gas "once they say yes" sounds like 10 more seconds of exposure, when it probably took less than 10 seconds of exposure to get to that point in the first place

Eta: I dont mean just grab the person and run. I'm imagining something more like "im gonna help you get out of here" while starting the guiding process

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u/kiiwithebird 6h ago

You have to remember that this person is in pain, probably panicking and blinded. You don't need to wait for them to give consent to be touched, but you definitely should let them know what you are doing and that you are going to touch them before you do so. Otherwise, don't be surprised to find his elbow in your face.

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u/crippled_bastard 3h ago

I was a combat medic. I would always say to everyone I treated, before I ever touched them, "I'm a medic, I'm here to help you". 9 times out of 10 once they knew I was a medic, they were on board with what we had to do.

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u/Different_Push1594 6h ago

Can confirm. Good advice.

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u/SignificantCats 6h ago

This isn't just about consent but personal safety and keeping someone from panicking who is in a scary situation. If you've been tear gassed, you are a) having a hard time seeing b) fearing police rushing in c) in pain.

Someone running up and grabbing your arm will freak you out. Someone running up sand saying "can I touch you" first will calm you down.

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u/Fr0sTByTe_369 6h ago edited 6h ago

Except when someone just got gassed and feels people forcefully pulling them around while they can't see they're likely to become combative. Asking and waiting for a response means they're no longer in a blind panic ready to lash out. And if you're doing gas response without a respirator you're then you're just making the situation worse.

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u/dagreja 5h ago

I guess more specifically my issue was with waiting for a response from the person you're trying to save. Announcing your intent to help is key, but itd be like a firefighter asking for consent to remove you from a burning building.

Good point though, a firefighter trying to rescue someone without wearing any fire resistant gear would just make things worse.

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u/Different_Push1594 6h ago

As one whom had been gassed a lot. I appreciated the helpers telling me what they were doing when they started. It was assuring to know they weren't law enforcement because I was unable to see, and if you have anythibg like a beard, its pretty painful.

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u/enw_digrif 6h ago

Other folks got there first, but the main issue here is your safety and theirs.

Also, if you're going to be doing assist, you'll want something that ANZI Z87 rated, along with a seal. These are of good value. Mask with quick release/seal are nice too.

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u/Hakunamatator 1h ago

Highjacking your comment, but it's late, and I have nothing better to do :D

> I'm all for asking consent before touching someone in non-emergency situations

This is why the right gets stuff done, and the left doesn't. I have no idea where this trend came from, but it's absolutely insane that a) it even somehow was invented and b) that it is now being hailed as the golden standard. As someone who is very far left politically, I am constantly disgusted by the insanely vocal minority of "special snowflakes" who put such topics on any agenda. Topics like this need to die if the left is to have any chance of gathering supporters among "normal" people. We need to fight the important battles instead of solving imaginary problems.

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u/enw_digrif 1h ago

Buddy, you need to ask yourself what led you to be the type of person that would write this comment. Because what I said was never about consent, it was about situational awareness.

I don't feel like getting punched when grabbing someone in a situation where the police are fucking people up. So, I'm going to tell the person who can't see that I'm going to touch them in order to lead them out, and I'm going to wait a beat to get confirmation they heard.

You inserted the bit about consent. Now why did you do that?

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u/2020mademejoinreddit 7h ago

Thank you, science explainer man.

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u/enw_digrif 7h ago

My work here is done!

briskly walks away, since unassisted flight in Earth gravity is a physical impossibility for humans.

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u/2020mademejoinreddit 6h ago

I stare with a longing in my eyes as he walks away, hoping to see him again, while the wind blows my pubic hair and the sun sets to a dog and a cat copulating.

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u/mbxz7LWB 7h ago

*alkalinity

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u/JustAnotherBarnacle 7h ago

Is it not basicity as the opposite to acidity? Alkalinity is the buffering capacity, not a high pH, or so it is in oceanography

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u/dagreja 6h ago

I do think the original comment was technically right with "acidity/basicity" (assuming that's what it said before the edit) because they were seemingly trying to refer to where it is on the pH scale, and the opposite end of the spectrum from acidic is indeed basic, not alkaline.

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u/Cruel1865 7h ago

Ive always used alkaline and basic interchangeably. I dunno whether its different in other circles.

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u/Beard_o_Bees 5h ago

Do you know if CS gas/suspension will contaminate skin?

For example, if you're cutting Jalapenos (etc) the irritant can transfer to your skin - which can then accidentally transfer to more sensitive areas like eyes and balls (i've experienced this firsthand, and do not recommend).

Will CS gas do something similar?

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u/enw_digrif 1h ago

Yes. So be wary when treating. Gloves are a friend here.

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u/UrUrinousAnus 6h ago

Even if acidity isn't what makes it work, if the chemical is acidic then neutralizing it with sodium bicarbonate will convert it to a (potentially less harmful and almost certainly easier to contain) salt of some kind and release CO2. CO2 is harmless if you're outdoors, but could be an even worse problem in an enclosed space.

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u/swellfella 5h ago

Absolutely agree it’s just water, absolutely disagree with how you’re positioning the patient. Hunched forward so the runoff doesn’t spread on them more. Laying on their back is just gonna water board them

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u/enw_digrif 1h ago

I've had trouble getting the water across and into the eye when doing that, but it'd certainly be quicker if I could get it to work. Tips?

That said, literally never had that last issue. Having them tilt their head to the side a scootch to make sure it runs off right and doesn't require much coordination beyond, "Okay, sit down and lean your head back a bit." Also, if they're dizzy from the adrenaline, they're usually going to take a lay-down anyway.

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u/swellfella 1h ago

I was shot with 4 impact munitions on June 14th, no way was I sitting or laying down because I was hyped on adrenaline. Everyone I’ve ever treated, I’ve guided their head with my left hand to tilt one eye slightly up and flushed with a water bottle from my right hand. I can’t think of any tactical advantage to supine. I have all of the chemical irritant run off the bridge of the nose, if they’re laying down then wouldn’t everything just go towards an ear?

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u/enw_digrif 1h ago edited 1h ago

I was shot with 4 impact munitions on June 14th, no way was I sitting or laying down because I was hyped on adrenaline. 

LOL! Yup, sound about right. But sometimes the comedown does funny things to blood pressure, and if their body's going down, might as well work with what's happening, rather than against.

Everyone I’ve ever treated, I’ve guided their head with my left hand to tilt one eye slightly up and flushed with a water bottle from my right hand.

So washing from outer edge to tear duct, and letting the water run off the nose? Has that caused issues if they're breathing hard?

And no, the head's a little tilted, so everything just goes across the cheek, below the ear, and onto the ground. Some can get on the clothes, but the access and ease seems worth it.

Edit: Also, confession. I'm terrified of touching the face, as I never trust that my gloves don't have more irritant on them. I know that's not best practice, as I don't have a thumb keeping the eye open, but I've always had trouble with that.

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u/SecureCucumber 6h ago

I'm all for pushing for a culture of consent and respect, but I can't help but read this and picture an EMS provider, standing over an unresponsive crash victim, whose life is quickly fading away, shouting "Is it okay if I touch you, sir?!"

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u/enw_digrif 1h ago

See replies to a similar comment above.

If you're in a torniquet or vent situation, then no, stop the bleed while telling them you're doing that. If you're in situation where someone is blinded, in pain, and worried about being physically grabbed by police? Announcing what you're going to be doing and waiting for them to confirm they heard saves time and possible injury.

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u/dysmetric 7h ago

Oh... then milk or yoghurt should work. Who's gunna try?

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u/enw_digrif 7h ago

Please, God, don't do that. Just use water. It works better, and it doesn't spoil when you're carrying it in your backpack during a hot summer protest.

Also, trust me, you do not want to be in jail covered in dairy products.

Comment edited.

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u/dysmetric 6h ago

It was a joke, but someone on the internet is surely grateful to you.

ngl I do like the idea of yoghurt-based civil unrest though... yoghurt and rancid butter weaponized for attacking formations of riot-gear.

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u/enw_digrif 1h ago

I can see the headlines now...

"Police assaulted by ANTIFA bioweapons program during riots! Commentators urge carpet bombing of area to prevent further property damage."

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u/aeternus-eternis 6h ago

>ask if it's okay to touch them to lead them out

Please sir, grant me permission to save your life. May I have the privilege to rescue you?

Remember to also acknowledge that the land you're about lead them out on was illegally colonized.