Using marked playing cards is one of the most deceptive ways to cheat in poker. It’s not easy to see, and it’s usually only useful if the entire game is being rigged against one player. It’s possible to make a living if it’s done right.

Marked playing cards have markings on the backs of their decks that indicate their suit and value. You can also use these markings to tell which card has been dealt or the suit of a particular hand.

This type of marking can be done by adding a small amount special dye to the back of a printed card. You can use any amount of dye, from ink that you can paint to a special chemical that reacts with a specific wavelength of light.

It’s not as popular as luminous and juice methods, but it can be a really effective way to cheat in certain situations. This is especially true if the deck is not shuffled properly, which can give you an advantage when playing Texas hold’em or Omaha.

These cards are also known by the names “contact lenses” or luminous ink cards. The ink on these cards is not visible to most people. However special contact lenses and glasses with a filter that allows for the visibility of the markings are available.

The most effective way to identify these marked cards is to perform a test known as the gamblers’ riffle test, which involves riffling through the deck rapidly with your thumb and looking closely at the card backs to see if any of the marks change while you’re doing it. This is a great way to identify luminous marked cards because the backs of these cards look just like normal cards to most players, despite being marked with a special dye.

Shade is another technique for marking cards. It involves using a small amount of aniline ink or dye to shade the card. The dye or the ink is almost invisible, but it can give enough color to gray the white areas.

Some cases have the markings printed on the front of the card using special ink that can easily be read with special lenses. These lenses will make the ink look like a thin, clear layer of paint that can be clearly seen through them.

Cheats can even place a dab or paint on the back side of a deck and then bounce an invisble light source from the card’s side. The cheater can then see through his contact lens or slightly tinted glasses the daub and paint, making it impossible to see for any other player.

This card marking technique is an old one that has grown in popularity over the years. It can be used to mark many different things, but is most commonly used on a deck of poker cards.

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