Close the lid and check it every once in a while over the next 24 hours.
Bubbles start to form on the egg shell immediately, which increase in number as time goes on.
But the egg remains intact because of a thin membrane, though which the yolk can be seen. Egg shells are made of calcium carbonate, another chemical compound. When these two substances react, carbon dioxide bubbles form from the carbonate and the egg shell disappears. All you need are two clear plastic cups, one filled with water and the other filled with a cold, clear soda like 7-Up. And raisins of course.