Laser engraving (etching) stainless steel with budget 15W laser engraver (Ortur Laser Master)

In my review of Ortur Laser Master (15W) I tried to engrave some metal, but without success. Then two comments suggested to me to use mustard on the surface. First, I thought it is a joke, but then I found an interesting article, where somebody successfully used mustard and vinegar for stainless steel engraving (or better word is etching). I am also trying again the marker provided with the laser, since this is recommended in the manual.

Review of Ortur Laser Master:
https://youtu.be/DkBVmveWDMM

Ortur Laser Master on Gearbest:
https://www.gearbest.com/laser-engraving-machine/pp_009731781853.html?wid=1433363&lkid=79710243

Article: Both Mustard & Straight Vinegar INDEED etch stainless..perfectly! See ya Ceramark, by rubbersoul79:
https://community.glowforge.com/t/both-mustard-straight-vinegar-indeed-etch-stainless-perfectly-see-ya-ceramark/17699

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Видео Laser engraving (etching) stainless steel with budget 15W laser engraver (Ortur Laser Master) канала My Tech Fun