Show 6 cards with different colors on the desk. 
Ask the audience to choose one card from the six cards and turn the card over. Put the 6 cards together.
The magician can find out the chosen card.

Feature:
The principle of the rainbow card  is so subtle that difficult to be seen with the aked eyes. You will know its wonderful effect after you tried.
The product can be used with other magic process or other tricks,will get better effect.

Comes complete with 6 crads with different colors and teaching video.