In this video, I explore creating a doodle using a glow-in-the-dark ink pen under UV light. The lines appear invisible until ...

Malcolm Lyall-Watson reports for Tomorrow's World on the computer interface of the future - a light pen that can draw directly onto a phosphorescent computer screen. The device, developed by ...

The “magic UV pen - fairies in the garden” is described as a blue secret message UV light pen with a fairy design printed on it, and has the product code “SKU: 29903”.