Watch the trailer HERE: https://www.theory11.com/marketplace/michael-obrien/blank-slate "Blank Slate" is based off the "Kiss trick." This effect is a bit more practical because the ring can be borrowed from a spectator. The magician vanishes it in a very fun way then has the spectator sign a blank card. The magician draws an image of a ring on the back of the card then magically pops the spectator's ring off of it. The dean image of the ring is gone and the card can be examined!