How to make a silver-coloured egg

To make a silver-coloured egg, you will need a hard-boiled egg, a candle and a glass half-filled with water. The glass should be large enough to fit the egg inside. Take the egg from the water and wipe it completely dry. Now ask an adult helper to assist you by taking a small candle and lighting it. They should then hold the egg with two fingers, one at the top and one at the bottom of the egg. Hold it in a horizontal position and bring it close to the flame of the candle. Once the egg just touches the flame, black patches will appear on the shell. The spots consist of black soot, i.e. small flecks of ashes produced when the wax burns.

So what happened?

The soot lies on the egg in overlapping layers. That makes egg’s surface very “creased”. Since soot flecks are very small, the “creases” are also very small and hard to see with the naked eye. When the egg is immersed, tiny air bubbles get trapped between these creases, and stay there even after the egg has been completely submerged. A thin layer of air is thus created between the soot and the water.

When the soot-covered egg is immersed in water, a film of air develops between the egg and the water. The submerged part of the egg appears silver because the line between the water and the air gives the egg a mirror-like surface. It reflects light from the environment, making it seem as though part of the egg has turned silver.