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Invisible ink for marking luminous playing cards

Many professional poker players will ask me if there has invisible luminous ink for making playing cards, because they want to mark cards by hand and save a lot of money for buying marked playing cards. We have marked cards invisible luminous ink for sale.
Our invisible luminous pen filled with playing cards invisible ink is used to write marks back poker. But you need to notice that these ink only used to marking contact lenses marked cards, if you want to mark bar code marked cards and infrared ink marked cards, it is not work. If you have not skill, it is better buy marked cards from us.
Do not forget to wear luminous ink contact lenses to detect invisible ink marked cards by yourself.