ELI5: Explain Like I'm 5

Formic acid

Formic acid is a type of acid. Acids are special kinds of liquids that often taste sour or bitter. Formic acid is an acid in particular that is found in some ant stings and in the sting of bees and other bugs. It is a strong acid that can burn you if you get it on your skin. It also has a very strong smell.
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