In traditional engraving the tools used in the process will etch the brass will expose the metal to air.  Eventually you will find that the engraved area becomes oxidized, darkening over time.  While brass does not oxidize with the obvious rust of iron, it is none-the-less a discoloring that will show the age and give a “lack of care” impression.
 
On the other hand, laser engraving uses a laser and only removes the pigment, or paint, on the surface of the plaque. Metal which is “laserable” also has a clear coat beneath the painted surface which is not removed by the laser during the engraving process.  This clear coat prevents air from reaching the brass, and thus protects it from oxidizing.  Years later the plaques will look the same as the day you gave them out.  Impressive!

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