Repoussé and chasing
Repoussé (French: [ʁəpuse] ) or repoussage ([ʁəpusaʒ] ) is a metalworking technique in which a malleable metal is shaped by hammering from the reverse side to create a design in low relief. Chasing (French: ciselure) or embossing is a similar technique in which the piece is hammered on the front side, sinking the metal.