Focus Three Bolts

The magician asks the spectator to choose one of the cards, each of which corresponds to the color of the bolt. The spectator must keep the color of his card a secret. The magician then places the bolts in the jar, casts a magic spell and shakes the jar. The bolt of the color chosen by the spectator will unwind.

The secret of the trick
As soon as the spectator has chosen a card, the magician already knows it color, since the cards are “marked”, look closely and you will notice. Bolts must be thrown into the container carefully. The “needed” bolt should be with the nut down, all the others with the nuts up. The container must be rotated counterclockwise and then the nut will unscrew.