What technique was used to create the portrait of King Akhenaten,his wife Nefertiti,and their three daughters (4.6.7)?

Name: What technique was used to create the portrait of King Akhenaten,his wife Nefertiti,and their three daughters (4.6.7)?
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The portrait of King Akhenaten, his wife Nefertiti, and their three daughters was created using the sunken-relief carving technique, which involves carving the design into the surface of the material rather than projecting from it.

What Technique Was Used to Create the Portrait of King