How To Make Electronic Displays With Mood Ring Ink

Posted by timothy on Saturday August 1, 2009 @06:30AM from the cheap-tricks-are-the-best-kind dept.

Soychemist writes "Print some thermochromic ink onto a sheet of paper, put metal heating elements on the other side, and you have a rudimentary color-changing display. Chemists in the Whitesides Group at Harvard think that the devices could be used to provide a simple readout from cheap medical tests and kits that check water for pollutants. In the past year, the same scientists have made a three-cent medical test and improvised a centrifuge with an egg beater. Their aim is to invent useful gizmos with everyday materials."

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Re:How is this electronic? by __aajfby9338 · 2009-08-01 07:23 · Score: 2, Insightful

Seriously, there's nothing electronic about this, it's only the mood ring ink connected to a resistance. I mean, it's all right for a home experiment but it's hardly useful.
It's not electronic in much the same way that thermal printers aren't electronic.