Fiber lasers work great on just about any metal. They quickly and permanently mark or etch amazing designs on firearms, tools, metal parts, and jewelry as well as industrial applications like engraving bar codes and serial numbers.
CO2 Laser Cutter/Engravers are extremely useful for basically anything. Anything made from trees (wood, paper, cardboard), plastics, leather, and rubber can be cut and etched easily. With enough power, they can also cut and etch metals…