An ink jet printer is disclosed, which jets a water-soluble ink from a recording head comprising at least an ink passage-forming member and an orifice through the orifice to form flying droplets which form a dot image on a recording medium, wherein at least a portion of the ink passage-forming member...http://www.google.es/patents/US6176912?utm_source=gb-gplus-sharePatente US6176912 - Ink jet printer and ink for ink jet recording
