This is one of our QUALITY USED MAGIC items. See the Used Magic section for more,
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Performer displays a dozen Jumbo Cards, six of which are red, and six black. The cards are shuffled and one red and one black card pulled out and placed face up on the table, (or resting faces to audience on a stand or against two glass tumblers, depending on your performing conditions.)
The other ten cards are shuffled. A spectator is now asked to guess whether a card is red or black as it is held back towards him. The card is placed face down (back facing spectators) on the appropriate red or black face out "leader" card. This is repeated with all the other cards, so that there are two heaps of six cards each. The cards are now turned to face the spectator, who has successfully separated the red and black cards without seeing their faces, by his "mental powers".
With a little presentation effort and suitable patter relating to the powers of the mind, this is an incredible effect.