A couple of years ago, a group of entrepreneurs successfully Kickstarted a little something known as the Chameleon Pen. In a nutshell, it's an art pen that changes color tone as you draw – for example, a green Chameleon Pen's ink progressively goes from light green to dark green as the ink is applied to the paper. The same group is now back with Chameleon Pens Color Tops, that change between two completely different colors.
.. Continue Reading Lizard-inspired pens change ink color as you drawCategory: Good Thinking
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