How to mark cards

Marking playing cards is a skillful art and requires more than practice. Some people use it for magic tricks and some others like cheating gamble.
In the past days, people try many ways to mark poker cards. The following are bad ways to mark cards because they are noticeable and will eventually get you caught; slightly different symbols on the back of the cards, bending corners or wearing down cards, and hidden camera usage.  But now one way beats them all. What is the most reliable way to mark your cards so far? Marking playing cards of numbers and suits with luminous ink by machine!
Luminous ink is a type of invisible ink used on the back of playing cards. Usually the red backed playing cards can get very good luminous marks for lenses. Invisible to the naked eye, yet with a red filter lenses you will see the markings. This is how magicians and poker sharks have advantages. Luminous ink is a new technology that helps burn markings onto cards, only red filters or infrared contact lenses can see.