Provided is a black ink capable of mitigating the dependency on image quality of recording media and giving a high quality image stably, which comprises at least one salt selected from the group consisting of (M1).sub.2 SO.sub.4, CH.sub.3 COO(M1), Ph_COO(M1), (M1)NO.sub.3, (M1)Cl, (M1)Br, (M1)I, (M1).sub.2...http://www.google.com.au/patents/US6332919?utm_source=gb-gplus-sharePatent US6332919 - Ink, ink set, ink cartridge, recording unit, image recording apparatus and image recording method
