The Kameleon by Pierre-Andre

The Kameleon enables you to perform two amazing routines that your audiences will remember forever.

Signature

While performing your favorite Ambitious Card sequence with your spectator's signed selection, you sign the back of the card. After the selection is placed in the center of the deck, you bring the card to the top again, but it is seen to have reverted to its unsigned state. A signature slowly starts to appear, and you pause to show your spectator that only half of the card is now signed. You rub the back of the selection a little more, and the full signature becomes visible.