The answer is yes, but only some, so in this article we will explain well which metals or with which materials. In some previous articles we have explained what laser engraving is, the material is heated enough by the laser beam that touches it, depending on time and power, a contrast is created or the material evaporates or burns.
The varnished or anodized metals can be engraved with a CO₂ laser, that layer does not reflect in the laser and the varnish evaporates with the heat, producing the contrast with the metal. On the other hand, metals that do not undergo any kind of varnish or treatment need a special chemical product to achieve the contrast.
The paste or spray for CO₂ laser marking is applied on the metal, always before starting the engraving process. In the case of the paste, it must be mixed with alcohol with a proportionality of 60/40 respectively and spread on the surface to be uniform (with the help of a brush). We will wait for the drying in both products, it is usually quite fast, to be able to process it with the laser. Once engraved, the excess or residual product is removed by cleaning the metal surface.