In inkjet inks, certain yellows inks can be seen to have uneven density and streak-like unevenness following long term storage or after aging at high temperatures. One aspect described is of a composition, to solve this problem, comprising an azo compound represented by (I), a tautomer of the azo compound, a salt of the azo compound, a salt of the tautomer, a hydrate of the azo compound, a hydrate of the tautomer, (or any combination of these compounds), a polymer dispersant, a radical polyrnerisable compound; and a radical polymerisation initiator.
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