section_path: Science and technology/Writing materials
section_name: Writing materials
paragraph_text: Writing materials
  
  In the 1st millennium BC, typical ancient Chinese writing materials were bronzeware, oracle bones, and bamboo slips or wooden boards. By the beginning of the Han, the chief writing materials were clay tablets, silk cloth, hemp paper, and rolled scrolls made from bamboo strips sewn together with hempen string; these were passed through drilled holes and secured with clay stamps.
  
  The oldest known Chinese piece of hempen paper dates to the 2nd century BC. The standard papermaking process was invented by Cai Lun (AD 50–121) in 105. The oldest known surviving piece of paper with writing on it was found in the ruins of a Han watchtower that had been abandoned in AD 110, in Inner Mongolia.