See through cards poker
Can we common people really see through playing cards? The answer is no. But we can see the value of cards with the help of invisible ink marked cards and infrared contact lenses.
After invisible ink printed on the back of playing cards, we can see the marks with human naked eyes, only infrared contact lenses and IR sunglasses can help us read the invisible markings. Because our eyes can not receive the reflection light of invisible ink. So, you no need to worry about others discover your secret.