The scientists used gold and silver nanoparticles -- just 5 nanometers wide -- embedded in a thin organic gel film to create the disappearing medium. Each nanoparticle is covered in molecules that change shape and attract each other in the presence of ultraviolet light. Using an ultraviolet "pen" or a patterned mask to apply light to the surface causes the molecules struck by UV to cluster and change color, allowing a message or image to be penned on the medium.
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