The first time i saw this was on CNN, an Electric paint that contains a non-toxic electrically conductive material. It comes in a pen called "Bare conductive paint pen".The amazing thing is that you can paint a light switch onto your wall without a socket, cables or wires. Its takes you to a new world of wireless electricity.

This new paint is designed to help people explore electronics, and learn about circuit making. It is now being used in projects around the world including interactive posters and home-made toys Read More http://skylighttechnologies..com/2013/09/electric-paint.html