Invisible ink marked cards is a public secret nowadays. Some people know nothing about it while many people know that these marked cards are used in the magic shows and even poker tricks.
It’s said that people can use a backlight to shine the invisible ink marks and see the marks just like the cash. But do you know how to see the invisible ink marks without a blacklight?
In fact, there are several devices that can read the invisble ink marked cards without any blacklight. They are marked cards contact lenses and infrared sunglasses. We call them marked cards reader. They are mainly used to read the luminous marks of invisible ink marked cards. Wearing the infrared contact lenses or glasses, you can see the marks clearly, which is perfect in the magic shows or poker games.