The history of cards marking

Historically, the first attempts to mark playing cards involved bends, crimps and tiny pin prick bumps generally known as “blisters”, resembling the Braille script. Later, when the first designs appeared on the backs of playing cards, cheats began altering the designs around the backs of cards. Hustlers have applied numerous inks, pigments and scratches, to add or remove lines or patterns from the back with the card design and style. Some varieties of card marking incorporate block-out operate, cut-out operate, scroll operate, shade operate and tint operate. 
More recently, science and technologies have also enhanced marked-card approaches. Modern technologies are variations of shade tactics. Conventional block-out and cut-out work have the disadvantage that they have to be read close-up, because the marks are small. On the other hand, an additional advantage of luminous and juice marked-card technology is that they’re able to be read close-up or from across a table.

http://www.cardslenses.com/marked-playing-cards/marked-playing-cards.html