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How to protect yourself from tear gas

[...]
Myths and misconceptions 

While they make for an amusing photo, these are not effective ways of countering this non-lethal chemical weapon.

INSI spoke to chemical weapons experts SecureBio about other home made methods – which should be avoided!

1. Soaking a bandana or cloth in apple-cider vinegar and tightly covering your mouth with it
Why should it be avoided?
- The acid contained in the vinegar does not provide enough, if indeed any, protection to counter the effects of tear gas.
2. Smearing lime or lemon juice on the inside of a cloth and tightly covering your mouth with it
Why should it be avoided?
- This supposedly works on the same principal as the apple-cider vinegar, but again, should be avoided.
3. Soaking a bandana in water and tightly covering your mouth with it
Why should it be avoided?
- Many RCAs come in the form of crystals, which react with water. Using small amounts of water (such as a wet handkerchief) immediately after exposure to CS gas is likely to reactivate these crystals and may prolong the effects.
4. Smashing up charcoal, lining a wet bandana with the dust and tightly covering your nose and mouth with it
Why should it be avoided?
- The charcoal supposedly filters out CS gas, but there is no evidence to support this.
5. Smearing toothpaste under your eyes
Why should it be avoided?
- As RCAs and toothpastes are made up from a wide range of chemicals, using various manufacturing methods, it is nearly impossible to accurately predict the reactions that would take place.
6. Sniffing a freshly cut onion
Why should this be avoided?
- Breaking an onion in half, sniffing it and getting it close to your eyes does not reduce the irritation, and it is likely to make you cry just as it does when you are peeling it.[...]

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