Buy infrared contact lenses
Infrared contact lens is a kind of special contact lenses to read invisible ink marked cards. It's similar to infrared filter. When you read marked cards with it, the invisible ink markings on playing cards will show up, and when you remove the infrared filter, the invisible ink markings disappeared, you can't see the ink any more. The biggest advantage of wearing infrared contact lenses to read marked cards is that no one knows you can see marked poke deck.
Where to buy perfect infrared contact lenses? You can buy from us derectly, or you can go and search markedcardsblog to look for other marked cards manufacturers.