Brain Wave Deck

You ask a spectator to name any card in the deck. He/She tells you which card she has chosen. You remove a deck of cards from its box and fan the cards. There is one card face up in the deck -it is the spectator's freely named card!  
Now, for the *second* climax. You prove that you knew the card to be selected in advance by showing that spectator's card has a different colored back than the remainder of the deck!  
Full Instructions of course, and this is truly spectacular. 

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