A unique way to show the material of Chinese antique jade

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In order to show the material of the Chinese antique jade, it is a general practice of the antique jade dealer to clean some exterior covering of the antique called window opening such as the area shown in the red circle in this Hongshan three bi ax and the Shang Dynasty jade cong..

This is quite different practice contrary to today’s fake jade which trying to cover some dirt to make it old looking.