Maybe you are confused about the function of one kind of anti poker cheating device, invisible pen for marked cards. Using luminous pen to mark invisible ink on the cards is easy. There are lots of different kinds of luminous pens for you. However, once you wear our IR contact lenses or IR sunglasses, you can see the markings on the back of marked playing cards.
Though it is easy to mark the markings on the back of marked deck, you’d better let us to process it for you. Because after you mark the invisible ink on the decks, you probably not use it because people can see the dirty marking by naked eyes. How to mark cards with an invisible luminous pen? Just contact with us.