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Luminous Ink Glasses
Poker players should have an invisible ink pen and sunglasses in their arsenal. There are several ways to make invisible pen visible, but the most popular is using a ultraviolet light. You can also use a black light or a specialized invisible ink marker that absorbs only certain wavelengths of light.
Another way to see invisible ink is by heating the paper. When you hold the paper over a 100 watt bulb or iron it, thymolphthalein condenses to reveal the message. Similarly, you can create a hidden message on a piece of paper by spraying it with a second chemical.