A radiation curable ink composition has improved adhesion towards rigid recording media, good jetting behavior and no or minimal health and safety risks. The radiation curable ink has a viscosity of 30 mPa·s, or less, at 50° C., has at least two monofunctional monomers, the two monofunctional monomers including a first monomer selected from an N-vinyl amide and a second monofunctional monomer being isobornyl acrylate, a difunctional acrylate monomer being propoxylated (or ethoxylated) neopentyl glycol di acrylate (SR 9003), at least one multifunctional monomer selected from the group consisting of a trifunctional acrylate monomer, a tetrafunctional acrylate monomer, a pentafunctional acrylate monomer, a trifunctional epoxide monomer, a tetrafunctional epoxide monomer, a pentafunctional epoxide monomer, a trifunctional oxetane monomer, a tetrafunctional oxetane monomer, a pentafunctional oxetane monomer, a trifunctional vinylether monomer, a tetrafunctional vinylether monomer and a pentafunctional vinylether monomer, the ink further includes at least one photoinitiator and a colorant.