Bare Conductive makes non-toxic, water soluble electronically conductive paint.
Initially I was going to use it to make a paper battery holder to power a small, glove sized heating pad, but the heating pad prefers a wired connection (check out my experiments in wearables at Frankenglove). Things to remember when working with conductive paint: its really gloppy and takes a bit of practice to get a smooth application that isn’t too thick. On the positive side the gloppiness makes a good conductive glue aka cold solder. The open jar photos above indicate that its not a liquid like most paint. Both the LED on my thumb and the LED on paper illustrate its glue-abilities. It also comes in a pen-like dispenser that allows you to draw the circuit or colour in conductive areas.
The paint was used to connect the conductive thread to the LED and as an adhesive to keep the LED in place. The paint for the positive connection overlapped with the negative so I had to scrape some off to separate the two before it would work properly. It looks like a bug when its off, but lit up, at night, one on each finger – its pretty awesome. It can be powered by much more discreet and interesting sources than the simple 9volt battery pictured below (e.g. button cell batteries as buttons or jewelry which light up the LEDs when the threads touch the battery). This is what it look like on:
Using a piece of card stock its easy to create simple circuits.