A company called Zink wants to release a printer that doesn’t use ink. Together with Polaroid, they have developed tiny printers that can print pictures without the use of ink cartridges. Basically, the printers use a special kind of paper with different layers, all of which react differently to heat. So you heat the layers differently and they each either turn to red, blue or yellow. Since there are no cartridges, the printers could theoretically be as small as they want to make them. The downside to this technology is that the special paper that the printer uses is very expensive – Zink wants to charge $20 for 100 sheets of paper.