metal embossing

Preferred label: 

In metalwork, a technique for decorating a surface by hammering the reverse of the object, sometimes into a mold of wood that has been carved in intaglio, to create designs in relief.

AAT

The Arts and Architecture Thesaurus Online, The Getty Research Institute.

Additional reference: 
http://vocab.getty.edu/aat/300054023
Alternative label: 
repoussé
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techniques
Getty AAT: