Wearable Technologies Design DuoSkin On-Skin User Interface by Cindy Hsin-Liu Kao DuoSkin is a fabrication process that enables anyone to create customized functional devices that can be attached directly on their skin. Using gold metal leaf, a material that is cheap, skin-friendly, and robust for everyday wear, we demonstrate three types of on-skin interfaces: sensing touch input, displaying output, and wireless communication. DuoSkin devices enable users to control their mobile devices and display information on their skin while serving as a statement of personal style.