The emergence time of the three major printing systems

Song dynasty. After the initial creation and development in the Tang and Five Dynasties, the engraving printing industry has been very prosperous in the Song Dynasty, and the three systems of official engraving, private engraving and square engraving have also formed a scale. There are many names of ancient book edition, but in summary, there are only three systems, namely official engraving, private engraving and Fang engraving. All books published by relevant official institutions are collectively referred to as official editions. Among the official engravings, the oldest and most famous is the certified edition. Books printed at your own expense in your own home are called private editions. Most of these sculptures are not for profit. Books carved by bookstores are all called square carvings. Booksellers engrave books for sale and profit, which is the biggest difference between square engraving and private engraving.