| http://www.w3.org/ns/prov#value | - 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 carbon black to the surface of which at least one hydrophilic group is bonded through another atomic group, an aqueous medium, and an organic silicon compound, the organic silicon compound being a silicon-containing s
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