Xconomy magazine calls it the technology that might have saved Polaroid: a small, portable, low-power, inkless printing system. It's basically a special paper that's got embedded crystals inside of it that turn from white to either cyan, magenta, yellow, or black when exposed to heat. The printer itself is a little thermal print head that can deliver microbursts of different temperatures at very precise locations. Just like with the old SX-70, the real money is in selling the paper. The first commercially available devices using Zink are on sale now.