What is invisible ink playing cards

Little people know about invisible ink marked cards. If I didn't work for markedcardsshop company, I would not believe that there are tools to help us see through the playing cards. You can see the cards' suit and value from the back of the playing cards.

Invisible ink marked cards is a kind of cards tricks playing cards, printed with invisible ink on the back of the poker cards. The marks can be any model you want, incorporated into the back patterns. From it's out looking, it is the same as the original cards. The tools to read these invisible ink marked cards are luminous contact lenses and sunglasses.