Since the invention of playing cards, card sharps have used markings on cards to cheat in games or perform tricks. This process involves secret markings on the back of every card. This is done to help cheats and magicians quickly and accurately identify the suit or numbers. Marked cards can be processed to read by different reading systems, such as infrared contact lenses or glasses, luminous ink, or scanner cameras.
Using marked cards in magic tricks can be tricky, as the spectators may assume that you are using a gimmicked deck of cards. There are ways of making the markings appear natural and not as if they were done to cheat. One way to make them look natural is to treat them like standard Bicycle Prestige Cards and not tell the spectators that you are using a marked set.
Investing in marked cards can improve your performance as a magician or poker player by making it easier to spot when someone is cheating. You can buy cards with hidden markings online or have them made professionally by a magician. It is important to keep in mind that using a marked set can cause controversy. It is best to discuss this with your fellow players prior to doing so. The integrity of the game is important and you should only use a marked deck when it is absolutely necessary.