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The marked playing cards is a special poker card made with infrared invisible ink, must use infrared contact lenses or sunglasses to detect cards marking. How to make palying cards with mark? You can use the invisible ink pen at home, but the effect is poor. Keywords: luminous marked cards, marked cards contact lenses, invisible ink contact lenses, invisible ink for playing cards, marking cards with invisible ink, marked playing cards with glasses, infrared contact lenses for sale.