Card on Tie

A deck is shown to be all blue backs. A spectator selects a card from your nice magic tie (not the deck). The spectator thinks of one of the cards and you spread the deck face up. You ask her to name the card she was thinking. You remove the chosen card and place it face up in front of the spectator. The deck is respread face down to show all blue cards again. You then turn their card face down to show it was the only red card in the deck.