A liquid ink development system for production printing was developed using liquid developer consisting of volatile carrier oil with a high boiling point and fine toner particles. To obtain applicability to a wide variety of production print applications, such as commercial printing, labels, cartons and soft packaging, the system was aimed to achieve high image quality, high productivity, wide media versatility, low running costs, and high post-process capability. For the purpose, in addition to newly designed developer and additives, an image formation process using a contact development process and tandem type electrostatic multi transfer process, back heat-type oil drying process, roller fixing process, and developer circulation and dispersion process were developed. High image quality comparable to analog prints, printability onto a wide variety of media and high post-process capabilities were achieved.