It's even resistant to an axe and a frustrated Smurf expresses the wish to be turned into a hot dog if he cannot break it.

Every Smurf uses the egg to make their wishes come true: to be red or yellow-skinned, to become a giant, to have an elephant, money, cakes etc.

Everyone is turned back to normal and, before they can renew their wishes, the egg cracks open revealing a baby chick.

He thus sets to work building an enclosure for the chick to live in, feed and water it and keep the place tidy.

After all his hard work, however, the Smurf is shattered when the chick grows up to become a non-egg laying rooster.

However, the potion does not fully work since he lacks a tail, so he makes a wooden one and glues it to the back of his pants.

Discovered without a tail, Gargamel rushes to Papa Smurf's laboratory and barricades himself in, announcing his intention to brew a potion that will transform him back into a human and enable him to lay waste to the village.

Since the process of hammering and polishing the required sheet of metal proves to be unbearably noisy, and he insists on working through the night, the other Smurfs demand that he continue in the forest.

The reflection does and says the same things as Vanity: the only problem being that his physical actions are still those of a mirror image and he speaks in reverse.

Vanity takes the reflection back to his house but since they do the same things at the same time they end up having to squeeze through the door, eat from the same bowl, sleep in the same bed (which results in a sleepless night) and use the same towel, which is ripped by both Smurfs pulling at it.

This series of incidents causes them to fight but then the reflection hits the wall and is knocked unconscious by a cauldron falling from the shelf above him.

Relieved, Papa Smurf returns home only to find a double of himself talking in gibberish and performing the same actions as him.

English versions of the book were published by Dupuis in Canada, Random House in the United States and Hodder & Stoughton in the UK.