Fournier Heraclio No.1 marked cards belongs to Fournier marked cards family. It is marked by our professional technicians with special and unique invisible ink. Paper marked Fournier Heraclio cards always used by magicians, blue and red cards can be marked with big font or small font. All of the markings (Number and Suit) are strong and deep into the texture of the cards. You can see it clearly with our IR Contact Lenses and Sunglasses, but cannot be seen by naked eyes. Please feel free to leave us your message, we will send you more information about our marked cards.