| http://www.w3.org/ns/prov#value | - Provided is an ink comprising a recording agent and a liquid medium for dissolution or dispersion thereof, the recording agent being a compound represented by the general formula ##STR1## 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, --NHCOC
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