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Should be fun to make such a pattern.
Haven't done it since school.

Croaker thank you, I feel honored by your question but I can not say from pictures.

The closeup is etched. IMO

Ah yes, there is.
If you don't want to etch it all, paint the other part with tar (asphalt) laquer.

Vinegar... takes long.
Nitric acid works faster. (Turkish kettle cleaner called "PorCöz" at...

If its a real damast the pattern would come back if you treat it with acid.

I have something similar here. Also french.
Have yet to hone it though.

Nice find!