Here's a trick from a long (long!) out-of-print set of lecture notes from Richard Sanders, called Make Believe (circa 1986). It uses flash paper and it's guaranteed not to singe your digits (I used it in my own restaurant work for years).
The magician has a card chosen, signed, then returned to the pack, whereupon a slip of paper, which has been resting on the table from the outset, is unfolded, revealing the name of the chosen card. This, however, only predicts the card, not the signature, so the magician tosses the slip into a glass, then picks up the glass and waves a lighter beneath it, causing the slip to burst into flame and transform into a folded card! The card is tipped out of the glass, then unfolded, showing it to be the signed selection!
The method is to prepare a glass by drilling a small hole through the bottom (alternatively, you could simply use a regular glass and toss a match inside at the critical moment - perhaps not as aesthetically pleasing, but certainly functional).
The card is forced, stolen from the pack, folded into sixths while palmed, then secured in a classic palm.
The prediction is (of course) made on a slip of flash paper, and once it is dropped in the glass, the hand with the classic-palmed, folded card picks it up by the mouth. A lighter is waved beneath the glass, and when the flash paper catches, you release the classic-palmed card. The transformation is quite striking.
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