| http://www.w3.org/ns/prov#value | - According to the present invention, there is further provided a recording unit comprising an ink container portion containing an ink, and a head portion from which the ink is ejected, wherein said ink is a pigment ink comprising self-dispersing type carbon black to the surface of which at least one hydrophilic group is bonded through another atomic group, an aqueous medium, and a silicon compound.
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