Invisible Ink Pen
Invisible ink pen, looks like athe normal pens or crayons, have very special invisible ink inside for marking poker playing cards.
When marking the right poker cards with this ink pen well, you can get invisible marks that people can't see with naked eyes and only wearing the infrared contact lenses can you see the clear luminous ink marks.
When marking the right poker cards with this ink pen well, you can get invisible marks that people can't see with naked eyes and only wearing the infrared contact lenses can you see the clear luminous ink marks.