The red eggs for birthdays are similar to the red eggs for weddings. In fact, the simplest way is to wash them, boil them, and then soak them in water with red paper. When the water turns red, put the eggs in for three minutes. Then pick it up and blow dry it with a hair dryer. Another way is to apply a red oily marker directly on it and let it dry on its own. It can’t be wiped off with water. Haha (markers are very cheap at one yuan a piece. This is what happened to me when my relatives got married. It’s very convenient, I hope it can help you)