How to mark playing cards

The marked pokers are very popular among poker players. Do you know how to mark a deck of playing cards?
Any brand of playing cards can be processed into marked cards. The poker cards can be processed into back marked poker cards and barcode marked poker cards.
The back marked cards are printed markings on the back of cards. If the cards' back are red, we mark them with big font in the middle or small fonts in four corners. These markings are white and black. If the cards' back are blue, we will mark them with big font in the middle. And the markings are white. What is more, the red back marked cards are better than the blue back marked cards. You need to use a pair of infrared contact lenses or sunglasses to read these marked poker and then you will have a big chance to win.