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:
   • Unboxing and review of Ortur Laser Ma...  

Ortur Laser Master on Gearbest:
https://www.gearbest.com/laser-engrav...

Article: Both Mustard & Straight Vinegar INDEED etch stainless..perfectly! See ya Ceramark, by rubbersoul79:
https://community.glowforge.com/t/bot...

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