No Camera trick
"
The magician displays four blue-backed cards which all have the same value. With a wave of the hand, the faces of the cards "vanish" leaving four blank cards! Next, the faces of the cards reappear, but the backs have all changed to red! The magician explains that no camera tricks have been used, and to prove it, he produces from within the four cards a sign which says "No Camera Tricks!" Finally, the magician admits to the audience that the entire trick was done with mirrors, and shows that the rest of the cards have changed into card sized mirrors!
Uses only basic card sleights.
Merlins of Wakefield