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 ...

Adult coloring books are made all the more fun when you have the right coloring tools to use with them. While crayons and colored pencils definitely have their place, the best markers for adult ...

The Chameleon Pen is so-called because it's capable of producing multiple color tones and seamless blending, all using the same single pen. Therefore, the ink which it produces changes color tone in ...