Mental Blockbuster Prediction by Juan Tamariz

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In December 1980, Juan Tamariz came over to USA. One of the things which he was doing was an effect involving two pack of cards. The thing seemed to completely baffle everyone. It certainly baffled me, Fred Robinson, Albert Goshman, Roberto and all . Juan said that the principle was an old one, credited to Val Evans, using an ingeniously faked pack of cards. Tamariz has written a book on the subject, in Spanish, and has kindly given permission for this (effect number eight in the book ) to be detailed here.
EFFECT
The magician secretly reverses any card and replaces the pack in its case. A spectator is given a second pack and asked to secretly reverse any card in it.
The magician now removes his pack and shows the reversed card. The spectator then spreads his and finds the card, which he turns round. They match.
The effect is then repeated with a different card. Bear in mind that the performer always reverses his card first and always reveals it first. There are no forces and it is a different card every time.
The effect does require two faked packs, both of which are reasonably easy to manufacture. However, the elegant Tamariz handling is full of subtle throw-offs, which seem to preclude any idea of ??trick cards. I have no doubt that if a dealer were to market this item he would sell hundreds. It really is most clean and baffling. The freedom, with which the spectators can handle the cards seems to rule out all known kinds of possible fakery.