New wallpaper technology developed by Institut Polytechnique de Grenoble can block Wifi signals being broadcast outside of the user’s vicinity.
Researchers at the French engineering university have collaborated with Centre Technique du Papier in the development of the wallpaper, which is coated in conductive silver ink that can block particular electromagnetic wave frequencies. This means that users will be able to benefit from a secure wifi network, alongside maintaining access to radio and mobile phone services.
Researchers have created a pen that can draw electrical circuits on paper, wood etc. through conductive silver ink. The ink is bendable when dry so even on folded paper the circuit can function. http://tinyurl.com/3purw9j