How do you tell if canned tomatoes are bad?

1. Look at the can. If the can is bulging, leaking, or has any signs of damage, it should be discarded.

2. Smell the tomatoes. If the tomatoes smell sour or off, they should be discarded.

3. Taste a small amount of the tomatoes. If the tomatoes taste bitter, sour, or metallic, they should be discarded.

4. Check the expiration date. If the tomatoes are past their expiration date, they should be discarded.

It is important to note that canned tomatoes can still be safe to eat even if they have some slight signs of spoilage, such as a slightly off odor or taste. However, it is always best to err on the side of caution and discard any tomatoes that show signs of spoilage.