Julio Montoro from Spain, has come up with an amazingly commercial way to materialize or visually change sharpie drawings on a spectator's single, signed, card; the magic happens right underneath their signature!
After the magic moment, you can immediately hand out the card without any switches or clean ups. You end completely clean and your spectator can keep their signed card as an unforgettable memento. The effect is fully customizable to wherever your creativity takes you.
Draw a circle and it turns into a coin to lead into your coin effect. Draw a kiss chocolate and give the audience a 'kiss'. Doodle some random numbers and turn it into your phone number. Clean and slick.