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 easier way. There are lots of different kinds of luminous pens for your choice. However, once you wear our IR contact lenses or IR sunglasses, you can see the marking ink on the back of marked playing cards.
Though it is easy to mark the marking on the back of marked deck, it is better for us to processed it. Because after you mark the ink on the decks, you can not use it because people can see the dirty marking by naked eyes. How to mark cards with an invisible luminous pen? Just contact us, we can mark the luminous ink on the cards with our professional technique for you.