Radical curing inkjet inks can suffer from oxygen inhibition. This has an adverse effect on the performance of the cured material - poor scratch and solvent resistance. An ink composition is given as comprising 1) (A) a radically polymerisable compound; (B) a suitable initiator; (C) a colourant. Compound A comprises at least one type of compound represented by formula (IIIa) and/or compound (IIIb) and at least one type of compound represented by Formula (IV) below.
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