First step:

Pour water and white vinegar in a pot in a 1:1 ratio. Then, boil some eggs. Once they are boiled, rub them with a wire sponge under water until they become snow-white.

Second step:

In a zip-lock bag, add powdered egg dye and uncooked rice (I added 75g of rice and one packet of egg dye), and mix them in the bag with one teaspoon of white/apple cider vinegar.

Third step:

Carefully place the eggs, one by one, into the bag, tightly close it, and shake it. Stop when you are satisfied with the final look of the egg. Take the egg out carefully with a spoon. There may be some rice left on the egg. I used an extra spoon to remove the rice carefully, so the patterns wouldn't smear. Place the eggs to dry in an egg carton.

Fourth step:

When they are dry, coat them with vegetable oil.