What do you know about marked playing cards? Are they just poker cards with markings? Absolutely no.
A professional marking way with correct invisible ink will not change the color and smell of playing cards. And the markings will be clear and lasting.
GS marked cards are a famous marked cards brand. No matter marking the invisible ink marked decks, luminous marked cards, luminous ink kit for marking cards.
Luminous ink contact lenses used with marked deck of cards, better than infrared contact lenses.