IR or UV marked cards are not any secret nowadays. They are usually used in magic shows and poker games. And many people know how to detect these marked cards with infrared contact lenses, special filter and some other item. In some countries, it's not good and safe to use such marked cards.
For many years' study and testing, we have the latest and most special one to one marked cards, which are much different from normal IR or UV marked cards. Neither the IR camera nor the Infrared or UV contact lenses and sunglasses can see through this one to one marked cards. The detector that can see the normal infrared marked cards couldn’t detect this special ink marks either.
Only use the camera with our latest special filter can you see through our latest one to one marked cards in the certain light. Even you get such cameras, you can see any marks if not in the right light, which make this one to one marked cards much safe to use.
Just enjoy yourselves with the amazing marked cards!