Further information: https://trumpf/en_INT/products/lasers/marking-lasers/
To make dark plastics white, the laser beam melts the workpiece material locally. Small gas bubbles form in the molten material which increase the volume be creating a type of plastic foam. This makes the processed area appear much brighter than the surrounding material. In some cases, the inscription projects from the surface. This is referred to as a foamed marking.
In the movie you could see how a TruMark laser make such a marking on a plastic platelet.
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laser marking
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