From a furtive Chinese character inked on a shoulder to a full arm sleeve, tattoos have enjoyed a revival in popularity in recent years. But soon they could do more than simply decorate the skin. Researchers have created temporary tattoos that can are sensitive to touch and can be used to control electronic devices like smartphones. Working in collaboration with Microsoft Research, researchers at the Massachusetts Institute of Technology's (MIT) Media Lab produced the temporary tattoos, whichare called DuoSkin. Using gold leaf, the temporary transfers can be used as touch sensitive trackpads or to transmit information to a smartphone.