The new NP4 belongs to the NP Series. It is an ink based on solvent delivering well-permanent markings on not porous substrate selection. In contrast to the NP3 ink, the NP4 has better decap time, better optical density, better drying time of not more than 3 sec and better adhesion to different kinds of substrates that are not porous like copper and synthetic paper, golden cardboard, aluminum-coated, PP, PVS, PC, OPP, PET, and APET.