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First of all, organize a plate for lasering and put it in a cardboard box so that the spray mist cannot spread everywhere. Spray the plate with white chalk paint and let it dry well; repeat the process.
Search for an image (SVG) on the Internet and upload it to the Creative Space and create a text. Here I used the writings Melanie and Hathway. The text and the image were lasered with surface engraving. Finally, rinse off the chalk paint with quite hot water. It's a bit fiddly. It is also said to work with all-purpose cleaner. Done :-)