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  • Onions contain a compound called Amino acid sulfoxides.
  • Every Knife stroke into the onion pops open cells releasing this amino acid sulfoxide and other enzymes which reacts to produce Sulfenic acids.
  • The Sulfenic acid in onions then forms a gas SYN-Propanethial-S-Oxide which reacts with the water in our eyes to form sulphuric acid that causes an irritating burning sensation.
  • Our smart brain immediately sends messages to the Lacrimal glands which produce tears to wash away the irritants and protect our eyes.
  • Some ways to prevent crying is by wearing goggles, keeping the onion inside the refrigerator 10-15 min before cutting or by cutting the onion underwater.

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