Magicians can use card marking to perform tricks. Marked cards have subtle markings on the back that can be read by a person using specialized glasses or contact lenses. This allows the player to see the value of every card without having it turned over or revealing their hand.
Many hustlers are still using card-marking methods to their advantage. They include card bends, engravings that resemble Brielle, and small bumps on the back of the cards. These markings are easy for a professional card dealer to spot and can be spotted by an honest poker player as well.
It is more difficult to detect advanced marking techniques. One method involves a special ink that can only be read with contact lenses or a gimmicked pair of glasses. Another technique involves shade marking, which uses a special filter to create the appearance of different shading on the backs of the cards. Lastly, video-luminous marked cards are recorded on a camera and displayed on a screen in another room to a partner.
Poker analyzers can also be used to work with marked cards. These marked cards have barcodes that can be scanned by a poker analyser. The analyzer will then tell the player what suit and value each card is. This is an efficient way to cheat in poker. However, poker players should be aware that they are responsible for making sure their sleeves and cards are not marked before a tournament begins. This includes identifying inconsistencies in color or cut, and any other identifier that may give the player an unfair advantage.