thanks all! plenty of good ideas. Ibrahim, I think it might be dangerous trying to etch in a metal container? Probably if its copper or anything weaker than steel it would be damaged.
I think etching without emmersing is probably my best option but what kind of etchant should I be using? I have access to Ferric acid but never used it before. The blade shows some faint patterns but I cant be sure what it is, thats why I want to etch.
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