A system using discharge orifices having waterproof ink orifices for discharging waterproof ink which becomes water insoluble after drying and non-waterproof ink orifices for discharging non-waterproof ink, a cap for covering the discharge orifices, and a suction device for effecting suction through...http://www.google.com.au/patents/US6447095?utm_source=gb-gplus-sharePatent US6447095 - Discharge recovery method for ink jet apparatus using waterproof ink and ink jet apparatus employing the method
