Heat Marking (aka Annealing) vs Laser Engraving - SCHMIDT Laser Marking Tutorial 

For Shark Week, we combined lasers and sharks to demonstrate the difference between a heat mark and a laser engraving!
A heat mark is a thermochemical reaction that creates an oxide layer on the surface of a part, producing a permanent mark. Engraving occurs when a laser displaces material in a part. This also creates a permanent mark - the difference is that the latter creates depth and a mark you can feel, which is not the case with a heat mark.
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The shark icon used for this mark was made by Freepik [www.freepik.com/] from www.flaticon.com.
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