A special tattoo ink that changes color based on glucose levels inside the skin is under development by Massachusetts-based Draper Laboratories. The injectable nanotech ink could eventually free diabetics from painful blood glucose tests.
"It doesn't have to be a large, over-the-shoulder kind of tattoo," said Heather Clark, a scientist at Draper. "It would only have to be a few millimeters in size and wouldn't have to go as deep as a normal tattoo."
Clark and her colleagues didn't set out to create a glucose-detecting ink.
"At first I didn't even think it was possible," said Clark.
Originally the scientists developed a sodium-sensitive ink to monitor heart health, advancing basic knowledge of electrolytes in the body, or to ensure athletes are properly hydrated...
http://dsc.discovery.com/news/2009/02/12/diabetes-tattoo.html
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