The dye the researchers are investigating for use in batteries comes from the roots of a climbing herb known as the madder plant.
via LiveScience.com http://www.livescience.com/25660-eco-friendly-battery-created-from-plant-dye.html
via LiveScience.com http://www.livescience.com/25660-eco-friendly-battery-created-from-plant-dye.html
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