A free radical curable liquid for inkjet printing of food packaging materials includes no initiator or otherwise one or more initiators selected from the group consisting of non-polymeric di- or multifunctional initiators, oligomeric initiators, polymeric initiators, and polymerizable initiators; wherein the polymerizable composition of the liquid consists of: a) 25-100 wt % of one or more polymerizable compounds A having at least one acrylate group G1 and at least one second ethylenically unsaturated polymerizable functional group G2 different from the group G1; b) 0-55 wt % of one or more polymerizable compounds B selected from the group consisting of monofunctional acrylates and difunctional acrylates; and c) 0-55 wt % of one or more polymerizable compounds C selected from the group consisting of trifunctional acrylates, tetrafunctional acrylates, pentafunctional acrylates and hexafunctional acrylates.

To a resist composition comprising a polymer comprising recurring units having an acid labile group and an acid generator is added a metal-acid complex. The metal is Ce, Cu, Zn, Fe, In, Y, Yb, Sn, Tm, Sc, Ni, Nd, Hf, Zr, Ti, La, Ag, Ba, Ho, Tb, Lu, Eu, Dy, Gd, Rb, Sr or Cs. The acid is a fluoroalkylsulfonic acid, fluorinated arylsulfonic acid, fluorinated tetraphenylboric acid, fluoroalkylsulfonimidic acid or fluoroalkylsulfonemethide acid. Due to a high contrast of alkaline dissolution rate before and after exposure, high resolution, high sensitivity, and controlled acid diffusion rate, the composition forms a pattern with satisfactory profile and minimal line edge roughness.