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What is back marked playing cards

What is back marked cards? It is one kind of marked playing cards with invisible marks on the back. There have Bee juice marked decks back, Bicycle ultimate marked decks, Modiano marked cards back or Copag luminous marked cards.
Generally speaking, naked eyes cannot see through back marked cards with invisible marks. But infrared contact lenses can assist us do that. It is easy and simple to see through marked cards.