Infrared marked cards
Infrared marked cards are playing cards with invisible ink marks on the back that are visible to infrared contact lenses or infrared sunglasses. Infrared marked cards are used for magic shows, poker games, and card tricks.
History
Marked poker cards appear in casinos in films from more than 20 years ago. And it's said that in a town in China, many companies and factories mark and sell marked cards. Ever since the beginning of the 20th century, people from all over the world try to get marked cards from China, which makes China the biggest country for marking infrared marked cards.
Manufacture
Infrared marked cards are produced on the basis of normal poker cards. All the infrared marked cards are marked with invisible ink marks on the back. Generally speaking, the same color ink as the back of the card is used for that poker deck. For example, red ink for the red decks and blue ink for the blue decks. Some are marked by hand or pen. And some cards are marked by machine like a printer. Take the site of infrared marked cards.com for example, their marked cards are mainly produced by special printer. Usually, a whole deck of infrared marked cards are exactly the same as a deck of normal poker cards. There are also suits and numbers in the marks which show a card, just like that on the face. The infrared marked cards can have the invisible ink marks in many ways, for example, small marks in four corners, special marks for suits in the middle, unique marks on barcode side.
Quality
The good quality marked cards are those original poker cards like Copag, Modiano, Fournier, Bicycle, KEM ect with invisible ink marks on the back but look no different to the naked eye. Usually, the infrared marked cards marked by machine are much better than those by hand.
| Good marked deck | Poor marked deck |
|---|---|
| Original brand cards | Copied brand cards |
| Invisible to naked eyes | Naked eyes can see some marks |
| Clear to infrared glasses | Unclear to infrared glasses |
Detecting
Since there are ways to mark poker cards, there are always ways to detect infrared marked cards. Usually some experienced guys can see the difference in color of marked decks. However, people can hardly see any difference, unless that marked deck is not so good. Easily, people can detect the infrared marks with special infrared filters, infrared sunglasses or infrared contact lenses. These devices can see any invisible ink marks of infrared marked cards. Also, the infrared marked cards can be detected with a money detector.
Examples for infrared marked cards
Copag infrared marked cards Modiano infrared marked cards
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