Laser marking is labelling or marking objects using a laser beam.
Laser labels are water- and smudge-proof and therefore very durable. They can be quickly automated and individually generated which is why we often use the method to number individual parts and to attach very small machine-readable labels (barcodes or QR codes).
The rational batch marking on the item is a further application of laser marking.
Annealing marking is also an option for metallic surfaces.
Some metals take on a colour from oxidation after being heated to a certain temperature.
The font itself is usually brown.
Another variant of the laser marking is targeted removal of colours from coated articles so that the underlying colour of the object emerges, a process that is mostly used with anodised parts.
The laser-induced removal of material allows deep engraving on all materials.
Engraving is not always accompanied with a change in colour, but the engraving is visible due the differences in surface textures. Laser engraving of this kind is very durable and can only be removed with deep grinding, which is why it is used for such things as tamper-proof engraving.
The labelling remains readable even after subsequent surface treatments.