Other issues to watch out for when food, wax, etc. is attached to the part where there is no letters, numbers, etc.
Preparations for a Weekday: Is One Allowed to Wash One's Hands Over Dirty Dishes in the Sink?;
Understanding the Concept of Creating Musical Sounds on Shabbos;
Salting Avocado. When Salting Cooked Meat, Eggs, Fish, or Potatoes, Does It Have to Be for Right Away or Could I Do It for...