Julie Barrett wrote a comment on CheerLights Christmas Tree.

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Although the video talks about the Ortur, this technique would work with any engraver. If you are super cheap, you can probably pick up a packet next time you buy a burger somewhere. You can buy a commercial marking solution called CerMark Black, but you probably already have mustard. Using a proper air assist can really expand the capabilities of these inexpensive laser cutters - something we recently saw upgraded with a 3D-printed air assist nozzle. On a laser cutter, the air assist blows away charred material leaving a clear field of view between the laser and the remaining uncut material. In case you think you don’t need to watch because we’ve already told you the trick, you should know that also goes into a lot of detail about preparing single line fonts to get a good result, among a few other tips like improvements to his air assist setup. You can see the result in the video, below. We’ve heard of this before, and apparently, you can use vinegar, as well, but since the mustard is a paste it is easier to apply. His solution? Smear the scissors with mustard. The problem? The laser won’t cut into the hard metal of the scissors. Wanted to mark some scissors with his Ortur laser engraver.

Laser for engraving