sheetfed offset printing

Lithographic printing is sometimes called chemical printing, which means that the printed image is on the same plane as the printed plate. It is based on the principle of "oil-water immiscibility" to achieve printing. This type of printing is to render an image on a stone or metal surface by mechanical or manual means, and then chemically treat the surface so that part of the image is ink-friendly, while the other blank parts are not ink-friendly. When printing, only the inky image part is transferred to the paper to form the impression. Photographic printing, lithographic printing and offset printing are lithographic printing.