Wood block printing
Wood block printing is a technique for printing texts, images or patterns. Wood block printing is a form of printing that cuts out the parts that are not to be printed, leaving the image or character to show in black. The content would print in reverse or mirror-image. However, wood block printing has only one downside, which is that the wood is not durable and long-lasting. Therefore, it is difficult to produce a large amount of prints in a very short period of time.

Source of information:
National Science and Technology Museum:http://epaper.nstm.gov.tw/chinascience/F/f4-1.htm

Data compilation：Chi-Wei, Chieh-Chang
Resource: Chinese Social Science