Anodic treatment is a surface treatment that forms an oxide layer on the aluminum alloy. Through laser engraving, the surface oxide layer will be decomposed.
Stainless Steel (with coating)
Due to the wavelength of CO2 lasers, stainless steel reflects most of the energy, so special oxidants are needed to allow the stainless steel to oxidize and darken at relatively low temperatures and darken the color. Wear work gloves when applying the coating.