Best KEM marked cards

That's how the KEM cards is. However, our technicians succeed in working out a method to mark the KEM playing cards after many years' testing and working. With a special mixed invisible ink, our skillful technicians mark the KEM playing cards with an advanced marking cards machine. And in the nice days, the KEM marked cards come out to be very good, being clean and dry and no naked eyes can see any marks at all while the infrared contact lenses can see the very clear marks.