Marked Poker Cards

Four cards of the same value are shown, and it’s explained that they form a poker hand. The blue backs of the cards are also shown. The magician explains that the cards are marked on the backs, though the marks are not visible at first glance. He then demonstrates how to reveal the marks. One by one, the cards are turned over in the deck, and suddenly, all four cards turn over at once. When shown from the back, they all have red backs, with the number and suit written in fiber on each. The cards are placed on the table, and the spectator clearly sees both their faces and backs.