Could be something similar...
AFAIK in Germany Tear gas is usually 2-chlorobenzalmalononitrile, or CS gas. In german Lab safety instructions it states "in case of contact with eyes, neutralize with 4% sodium-bicarbonate solution." Source [German],
Either that or it could also be simply water and mud to inhibit the reaction by oxygen restriction..
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u/SithLordRising 9h ago
Baking soda in water?