Whether you’re an avid poker player or simply enjoying a game night with friends, card marking can give players an unfair advantage that compromises the integrity of a game. Luckily, there are several ways to spot these deceptive tactics and level the playing field.
Marked Cards Detection Methods
There are many ways to mark a deck of cards, some of which are glaringly obvious to onlookers while others require the use of hidden devices or sensors. Some of the more common methods include block-out marks, tinting, and luminous or juice marking. While some of these techniques are incredibly advanced, others are relatively straightforward for experienced cheaters.
Other methods for marking cards include using solvents that smear existing ink, abrading or cutting marks, etchings or scratches on the surface of a card, matting agents that alter reflectivity, and bending or curling of cards. These simple changes in a card’s surface can allow a player to read the rank and suit of a card without anyone noticing.
For the most sophisticated card markers, new types of invisible chemicals that can be seen through lenses and cameras are being used. One example is luminous marking, which uses green ink and requires special sunglasses or contact lenses to detect. Another is juice dust, which involves applying a paste-like material called daub to the back of the card during play and allows for discreet marking without alerting players of their intent. Despite the growing sophistication of these techniques, vigilance and regular checks during gameplay remain essential to maintaining fairness in card games.