Invisible marked deck of cards

Lots of poker players are curious about marked cards of invisible ink and want to know more about the infrared contact lenses. What is a marked deck of playing cards? Usually the playing cards can be marked with invisible ink in all 4 corners or 1 jumbo invisible ink number and suits on the back of magic marked deck cards. How to mark cards while playing poker? It is not good to mark cards when you are in games. It's better that you prepare the marked playing cards in advance. And the best way is always to buy the high quality marked cards from marked poker cards factory for they always get the best way to mark poker cards by machine. Usually any brands and models of playing cards are available, such as the Bicycle, Bee, Fournier, Copag marked cards, luminous marked cards Modiano and other brands ultimate marked deck. Marked cards looks no difference to the normal poker cards for they are invisible ink marked cards. Just use the infrared contact lenses to see these marked deck of cards while playing games as usual. No one will see the difference.