Invisible Ink Glasses

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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.

Heat the paper to see the invisible ink. When you iron the paper or hold it over a 100-watt bulb, the thymolphthalein molecules condense and reveal the message. You can also create a secret message on a sheet of paper by spraying a second chemical.