Best Use of the marked poker cards

Plain paper or plastic letters are printed with previously invisible ink. Under the special contact lenses or luminous sunglasses lenses, the invisible marks on these cards can be shown. These processed playing cards are called marked cards. Marked poker cards are quite popular in the magic show, casinos and some private games.
Variation of marked cards
Numerous poker players are concerned that placing a poker phone analyzer on the Texas Holdem table might raise suspicions