We got used to the idea that we can use solar power as an alternative source of energy. The group of designers worked out a concept of a portable printer that uses solar energy as ink. In other words this device produces "suntan" for paper.
Hosung Jung, Seungin Lee, Yonggu Do and Junsang Kim designed a new-generation device that burns out the upper layer of the paper in the shape of letters on black and white images. Till it is just a concept, you can use brand-name printers with installed CISS by INKSYSTEM.