Invisible luminous ink is always for tricks for they must need a luminous ink reader to read the invisible ink marks.
What is a luminous ink reader? The luminous ink reader is a tool to see the invisible marks. Usually the most common reader are glasses. The more rare readers are luminous contact lenses.
Luminous ink glasses are the most common luminous ink reader. The glasses are disguised as red sunglasses. The frames are authentic (any brand) glasses and can even be prescription glasses. The coat of red filter film on the glass is actually the luminous ink reader. These readers will be able to detect the luminous marked cards. This reader is the most cost efficient, durable, and safest type.
Luminous ink contacts are the most rare version of luminous ink readers. The contacts have a red filter in the middle of the contact that only covers your pupil. To anyone else they see your regular color eyes but in your vision, you see red. We recommend reading the precautions and cleaning the contacts as instructed!
In conclusion, infrared contact lenses and sunglasses are the two main instruments of the luminous ink readers.