Why do onions irritate your eyes?

  • Thread starter RuroumiKenshin
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In summary, onions contain a chemical compound called syn-propanethial-S-oxide that is released when the onion is cut or damaged. This compound reacts with the water in your eyes, creating sulfuric acid which irritates the eyes and causes tears to form. This is a protective mechanism for the onion, but can be uncomfortable for humans.
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RuroumiKenshin
Why do onions irritate your eyes?
 
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Demons.
 
  • #3
it contains sulfuric compounds
 
  • #4
How do these sulferic compounds affect our eyes? What do they do?
 
  • #5
sulfur compound + saline = sulfuric acid (very very small amounts)
 

1. Why do onions make you cry?

Onions contain a chemical compound called syn-propanethial-S-oxide, which is released when the onion is cut or chopped. This compound irritates the eyes, causing them to produce tears as a natural defense mechanism.

2. Can anything be done to prevent or reduce the irritation caused by onions?

There are a few things you can try to reduce the irritation caused by onions. One method is to chill the onion in the refrigerator before cutting it, as this can slow down the release of the irritant compound. Another option is to cut the onion underwater, as this can help to trap the compound before it reaches your eyes. You can also try wearing goggles or glasses to protect your eyes while cutting onions.

3. Why do some people seem to be more affected by onion fumes than others?

The sensitivity to onion fumes varies from person to person. Some people may have more sensitive eyes, making them more prone to the irritation caused by the onion's compounds. Additionally, the amount of tears produced can also vary depending on factors such as age, gender, and the amount of exposure to the onion fumes.

4. Do all types of onions cause eye irritation?

All types of onions contain the same chemical compound that causes eye irritation, so they can all cause tears to some extent. However, some varieties, such as sweet onions, may have a lower concentration of the irritant, resulting in less eye irritation.

5. Is there a way to cut onions without tears?

There is no foolproof way to cut onions without tears, but there are some tricks you can try. Some people suggest lighting a candle near the cutting board, as the flame can help to burn off the irritant compound. Others recommend chewing gum while cutting onions, as the act of chewing can help to reduce the amount of tears produced. Ultimately, finding what works best for you may take some trial and error.

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