Marked playing cards refers to the poker cards that has been marked with luminous ink or invisible ink marks for only wearing infrared contact lenses or poker IR sunglasses can see.
People like using these marked playing cards because they look the same as the clean playing cards and people can't see any marks with naked eyes. Usually these invisible ink marked decks are used in the magic shows for the magicians can wear the IR contact lenses to always get the card he needs.
Our company offer you the luminous ink that can help you to mark the red playing cards for contact lenses to see, and also some for marking IR cards for IR camera. And if for blue cards marked for contact lenses, you'd better buy the high quality marked playing cards produced by our machine. It's much better to see and more safe to use in poker games.