Other issues to watch out for when food, wax, etc. is attached to the part where there is no letters, numbers, etc.
Does the Melacha of Gozez Apply to Feathers on Cooked Chicken?;
What Are Some of the Halachot of Pouring Water on Saturated Ground?;
דבר דבר (Dabair Davar): Saying Something in a Different Way;