Living in a children’s home we receive donated food items rather often. Many, many times we receive boxes of dented cans from stores. I have known for years that you shouldn’t buy dented cans from the store, now I know why, especially if they contain acidic foods.
We got several cans of tomato soup in our food order a few weeks ago. I went to make lunch one Saturday and was going to serve the soup, all of which came in dented cans. After I opened the cans and poured them in the pan, I noticed that it was a strange color and had a strange smell. I looked inside the cans they came in and noticed that there was rust or some type of corrosion right where the dent was.
What must have happened was when the can got dented it stretched and tore the plastic liner inside the can (all iron based food cans, have a thin plastic liner) which allowed the metal to corrode. I will be much more cautious of dented cans in the future.