Glasses that see invisible ink
What kind of glasses that can see invisible ink? Luminous glasses, x-ray glasses or infrared glasses? In fact, all these marked cards glasses can see invisible ink, but they see different kinds of invisible ink.
Take marked playing cards as example. If you use backside invisible ink marked deck, you can see the markings by luminous glasses; x-ray glasses is for special invisible ink juice cards, while infrared glasses is for infrared ink marked cards.
What's the feature of invisible ink glasses? If you have use it before, you would know that after you wear it, you can see the hidden markings easily but the things around you will become blurry. Please ease your mind, people around you will never know about it if you act normally.