A Color Change

USE a blue-backed pack and on the bottom place a red-backed
short card. Fan the pack for the free selection of a card being careful not to expose the red-backed card at the bottom. Have the chosen card noted, put on the top of the pack and bury it in the middle with a complete cut. Square the cards very openly, tapping the ends and sides on the table to obviate any suspicion that you night keep the location.
Put the pack behind your back saying that you will try to pick out the selected cards under impossible conditions. Riffle to the short, take off that card and the next, the selected card, as one card and bring them forward showing the face. The spectator admits that the card is his and you ask him if he knows how you could possibly know it was his card. He says 'No'. 'Because it has a red back' you say, turning the card and showing the back. Drop the two on the pack and take off one only. Snap it to show it is a single card but don't show the face again.