Other issues to watch out for when food, wax, etc. is attached to the part where there is no letters, numbers, etc.
Understanding the Difference Between Three Melachas: 1-ZOREH, 2-BORER, 3-MERAKED;
Putting Salt into Cholent, Soup, Etc., and Pieces of Radish, Onion, Garlic, Etc.: Eating Right Away;