The writing tools used in bamboo slips are pen, ink, knife, chisel and so on. The characters on bamboo slips are written with pen and ink, and the main function of the knife is to correct typos, not carving. Bamboo slips in the pre-Qin period used ancient prose and seal script. After Qin Shihuang unified China, official script became popular, and the font became round, so official documents and letters all used official script.

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