Infrared contact lenses to see invisible ink
Wearing a pair of infrared contact lenses would help you see invisible ink on the back of marked cards. And these special marked cards contact lenses are simple operation devices that you could use them easily.
First of all, many poker players know the back invisible marked cards and infrared contact lenses are useful combination to win money at poker games. Infrared contact lenses has been processed by invisible ink but they have no difference from the regular contact lenses in the surface. You can use the invisible ink contact lenses to read back marked cards. In these poker games, you have a big chance to become the winner, because you could see poker points and poker suits on the back of invisible marked cards clearly.
There are no any flaws that other people will find the secret of these special invisible marked cards and infrared contact lenses, because we make these products with professional technology.