prov:value
| - An ink composition according to claim 12, wherein the pyridine group is of the formulae wherein R1, R2, R3, and R4 each, independently of the others, is a hydrogen atom, an alkyl group, an alkoxy group, a polyalkyleneoxy group, a hydroxy group, an amine group, animine group, an ammonium group, a cyano group, a pyridine group, a pyridinium group, an ether group, an aldehyde group, a ketone group, a
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