Some plastic food packaging will need to be engraved with a serial number and an expiry date. These markings can be made with ink, but ink may fade away or smear if it is not allowed to dry in the production line. These images show an alternative method where the markings are engraved with lasers. The laser is shone on one point for a brief period, allowing the nontransparent layer of the packaging to burn away while preserving the transparent layers. This method has no risk of fading or smearing, and the actual engraving is inside the packaging. The timing of the laser does not allow movement of the pointer and manages the exposure time. Therefore, the engraving takes place one point at a time. The circles of this engraving process are visible at the microscopic level.