| http://www.w3.org/ns/prov#value | - An ink cartridge having an ink container portion for holding an ink, the ink comprising a recording agent represented by the general formula ##STR20## where R1 is a radical selected from the group of lower alkyl, lower alkoxy, --COOM, and --SO3 M; R2 and R3 are respectively a radical selected from the group of hydrogen, lower alkyl, lower alkoxy, amino, --NHCOCH3, --SO3 M, and COOM; R4 and R5 are
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