An inkjet ink, including (A) a resin, which is (A1) a terpene resin or (A2) a terpene phenol resin, (B) a solvent system including (B1) a volatile organic solvent having a boiling point of less than 100° C., and (C) silver nanoparticles. A printed article, including a substrate, and an opaque film disposed on the substrate. The opaque film is formed from the inkjet ink.