Once the grooves are engraved in the copper layer (see Mastering page), along with the information necessary for their identification, the master discs are immersed in an electroplating bath.

During electroplating, an electric current flows through the bath, between the nickel beads (anode) and the copper disc (cathode), creating a nickel deposit on the copper disc.

We then separate the nickel layer from the master disc, obtaining a mirror image, a negative, called a matrix or stamper.

DMM technology allows the direct production of multiple matrices from a single DMM master disc.

The development of lacquers generally requires a triple electroplating process, complicated and costly. The lacquers are covered with silver then immersed in an electroplating bath.

During electroplating, an electric current flows in the bath, between the nickel beads (anode) and the silvered lacquer (cathode), creating a nickel deposit on the silvered lacquer.

We then separate the nickel layer from the master disc, and obtain a mirror image, a negative, called a "father".

A new electroplating is done, starting from the "father" allowing the obtaining of the "mother", then a third....

After the various galvanization steps, more or less numerous depending on whether the engraving was done in DMM or on lacquer, we obtain an "unformed" stamper.

Indeed, the latter must be prepared for the presses. This process takes place in several stages. The back of the stamper is ground and smoothed. It must then be precisely centered (according to the grooves) before cutting the central hole. The edges of the stamper are deburred, then shaped and adapted to be mounted on the press molds.