| http://www.w3.org/ns/prov#value | - According to an embodiment of the present invention, there is still further provided a recording unit, comprising an ink container containing an ink and a recording head portion for ejecting the ink in the form of ink droplets, wherein the ink is an ink for ink-jet comprising a coloring material containing a self-dispersing carbon black having a hydrophilic group bound directly or through another
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