Qijia ancestors have a habit when cutting jade materials, whether it is single-sided cutting or double-sided cutting, when the cutting is fast, the jade material is directly broken, which is also the jade or utensil with the cut. There is often a reason for a relatively straight bristles. Considering that there were no such hard metal tools at the time, it was speculated that the ancestors of the Qi family should be cut with sharp slabs made of sharp bladed tools.
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