Which of the following is NOT a reason to reject canned products?

High acidity in canned products is not a reason to reject them, as many canned foods are meant to have a certain level of acidity for preservation. For instance, foods like tomatoes and pickled items often have high acidity, which helps inhibit the growth of harmful bacteria. The preservation process for acidic foods is based on their pH level, which can actually contribute to food safety.

On the other hand, options such as dents in seams, swelling, and leakage or absence of labels are all significant indicators of compromised product safety. Dents in the seams can indicate potential damage to the can's integrity, leading to a risk of contamination. Swelling can suggest that bacteria are producing gas inside the can, which is a sign of spoilage or possible botulism risk. Similarly, leakage can allow contaminants to enter the product, and a missing label means there is no information on the food’s contents, expiration date, or storage requirements, which is critical for consumer safety.