Food Canning Facts. When processing foods using the open kettle method, jars should still be sterilized. When you cook the foods in the jars, the jars do not need sterilization, but should be thoroughly washed.
Meanwhile, horizontal ridges are more likely to signal a problem. One condition, Beau's lines, is characterized by indentations across the nail bed that are a sign of disrupted growth due to illness.
1 If you are taking care to eat plenty of protein, calcium and vitamin rich foods, but your fingernails are still displaying deep ridges it could mean that your body is having nutrient absorption issues. 2  If this is the case, it is important to consult a doctor to find out what is going on.