Tin printing ink, one of lithographic inks. A general term for inks applied to letterpress offset printing machines and wet offset printing methods for printing iron sheets (tinplate) and for processing steel sheets, aluminum sheets, and other metals. Iron printing ink can be divided into inner coating and outer coating. External coatings can be divided into printing white ink and roller coating white ink, color ink, varnish, etc.

With the continuous maturity of printing technology based on electrostatic, ion, magnetic recording, inkjet, thermosensitive and other imaging methods and the production application of corresponding equipment, people gradually classify printing technology and equipment with printing plates, screens, etc. as media For pan-traditional printing, the former is dubbed "digital printing" because of the significant electronic and programmed control of the printing process, that is, digital printing (also known as "digital printing"), and the corresponding equipment is called digital printing machine.