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 ...

Colored, special effect inks, used in permanent markers, printers, or other dispensers, have a very attractive appearance and are extremely popular for lettering and drawing on non-porous materials.

When E Ink first unveiled its Advanced Color ePaper (ACeP) in 2016, we were optimistically hopeful for the possibilities of comics, magazines, and textbooks in color on our Kindles. That appears to ...