Luminous Ink Kit for Marking Cards Used to Cheat Poker or Magic Tricks Luminous ink is used to mark cards to cheat poker or for magic tricks The luminous ink kit will come with everyting needed to mark your own cards. Up to 20 decks of cards per kit. Luminous ink is only used on red backed authentic paper based playing cards. This kit comes with a fine tip paint brush, luminous ink, red filter film to view markings, and detailed directions.