Reflective materials as well - i.e.: a polished stainless steel knife blade?

Here is something about this:

There was also a topic about stainless steel, unfortunately I couldn’t find it quickly. In short: you can’t cut stainless steel but if that is treated with special compound/liquid you can engrave it (there were a short video about it to external web site). Maybe someone can link it in here.

EDIT: Here is the what that I was looking about:

and here is the post; where was the video about it:

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