Invisible Ink Cheating Playing Cards are the most used marked cards for cheating in card games. These cards are marked with UV invisible ink in a unique pattern on the center and edge of the cards. User can easily detect cards of the opponents by decoding this marking pattern. Invisible ink can be used on normal paper cards to convert them into invisible ink cheating gambling cards. These marked cheating cards look like normal playing cards. The secret invisible markings on these marked cheating cards can be clearly seen with the cheating contact lenses.