“This daub is great! I examined the cards for quite a while and I didn’t see anything unusual or out of place. I was amazed when the red and black cards were instantly separated simply by reading the secret markings on the backs. Now, I’m a believer!” Daryl – The Magician’s Magician Daub is a card marking material and a closely guarded secret in the gambling world. Used by professional gambling cheats, this method allows the gambler to mark cards “on-the-fly” during play. This is the real deal and is now available for magicians! Imagine, borrowing a deck of cards and creating a key card by placing a daub mark on the back of a card! Virtually invisible to the untrained eye, this marking system allows you to locate a card FROM THE BACK without ever seeing the face of the cards! This product comes complete with directions for application, suggested uses and routines and enough red and blue daub to mark thousands of cards! Magicians now have the ability to put this tightly guarded secret to use for magical purposes! CAUTION! This product is sold as a tool for magicians for entertainment purposes and is NOT be used to cheat at gambling!!!