To meet your need of marking cards yourselves, our company offer you the luminous ink that can help you to mark the playing cards for contact lenses, and that for IR camera are available as well.
Usually the ink is better to mark red cards rather than blue or black cards. And if for blue cards marked for contact lenses, you had better buy the marked cards directly that marked with invisible ink by machine, just for the color not good.
We don't sell ink in bottle, neither becuase they are too expensive, nor they are not easy to pack. We can pack all the products well and protect them well for shipping. But for the ink in bottle, it's too difficult to send out for it's liquid.
For easier shipping, we usually sell invisible ink in pens.
The invisible ink can mark both paper cards and plastic cards.
Attention: WINNING is NOT guaranteed and furthermore, using the company's products to win money by cheating while in Casinos or Private Games is FORBIDDEN. Please be aware of the fact that in some countries cheating at gambling games is considered a crime and therefore punished by law.