Let’s give this topic one more quick look.
Laser marking is rapidly replacing older product marking technology, especially for direct marking applications which aid in tracking and traceability. From medical devices to automotive and aerospace parts, part information is showing up everywhere, either in the form of human readable alphanumerics and barcodes or Data-Matrix™ codes. Laser marking is a fast, clean marking technology, which also has benefits like flexible automation, improved environmental profile, and low cost of ownership. There are a few different technologies out there - and the “best” one for your application depends on the kind of mark you’re trying to make, and the material you’re using.
Laser marking is a great way to produce dark marks on stainless steels; by precisely controlling the laser and heat input, you can get an oxide layer to build up on the part, which, in turn, produces the characteristic appearance without melting the material.