Pen Draws Working Circuits With Silver Ink

Professors Jennifer Lewis and Jennifer Bernhard at the University of Illinois have come up with a way to draw circuits with a pen.
Not circuit diagrams. Any old pen can do that. No, the pen is a rollerball with silver ink that can actually draw real, working circuits. The ink dries to leave silver trails behind [...]

Source: http://www.wired.com/gadgetlab/2011/06/pen-draws-working-circuits-with-silver-ink/

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