Ignoring my price and re-usablity points - -
This one looks like fun:
Words and pictures:
http://spectrum.ieee.org/geek-life/h...conductive-ink
One (USA) on-line source for the metals:
http://www.mcssl.com/store/gallium-source/gallium-metal
http://www.mcssl.com/store/gallium-s...--indium-metal
(It looks like a minimum amount is around $50)
Mid-page, a chart of various tri-metal combinations:
http://sci-toys.com/scitoys/scitoys/...uid_metal.html
So if someone has the $50 .. $100 to spend, and tell us if the ink beads up or flows on top of the Kindle's solder mask ...
The required video: