Best Way to Mark Dal Negro SAN SIRO Playing Cards

Why invisible ink marked cards and perspective poker contact lenses is very practical and helpful in poker games or magic shows? It is said that perspective IR contact lenses provide an pair of perspective eyes for magician. All the hidden mystery is very clear to them.
When the players wearing the marked cards contact lens, all situation of game is no longer mysterious. You can see clearly the advantage and disadvantage of everyone, which is the key to make a wise decision in the game so as to be the last winner.
Italian Dal Negro San Siro marked deck is processed with the original Dal negro playing cards, which is a hot sale product of our company. This Dal Negro San Siro marked cards are widely used all over the world.