Invisible Ink Barcode Marked Cards

The side marked cards may refer to the invisible ink barcode marked cards that is mainly for poker scanning cameras to scan in the marked cards scanning system. 

Usully our technicians mark the four sides of regular poker cards with invisible ink by special machine and then they become the side marked cards. Any brand of poker cards could be processed to be the  barcode marked cards. 
No infrared conatct lenses can see the barcode marks and only the poker scanner camera can read the invisible barcode marks for poker analyzer.