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How do you transfer the graphic? Flat plate of iron don't fit to grinded profil of straight razor.

Ferric chloride is fast enough for me. About 20 minutes for carbon steel. Not so long.
If want made only dark etch without deep engraving effect, enough less than ninute.

I've never used other chemical material than ferric chloride. This solution is really ok for eching the steel.
I still have got a first s.razor reeched this metod and no any additional corrosion in...