Metal marking method 1: Annealing
During annealing, you work with a defocused laser beam, which allows you to introduce only low heat into the material. This heat output leads to local change in the structure of a metal, resulting in recoloring of the metal. The surface is not damaged, and remains smooth and clean. Depending on the temperature, the process can generate deep black or different colors. The marking disappears again when the metal is heated to about 200°C.