Starting with a sheet of metal, you use a wide range of implements and beat it from both the front and the back many times to create a three-dimensional form. Some are highly pronounced three-dimensional forms, while others are shallow reliefs like those seen on brooches and kimono sash ornaments.
How to do embossing
"What Are Traditional Crafts? -A Guidebook to Seeing, Learning, and Enjoying-" Edited by the Japan Kogei Association Eastern Branch. Published by Unsodo ／ List of works English translation: Kazuko Todate (Art critic / Art historian)