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I made my etcher from an old 4.5V adapter and a q-tip. Tape one lead to the blade and the other goes to a q-tip soaked in electrolyte (salt and vinegar). Very simple, but practice on some scrap...

I'm working on a similar issue with an old Wade and Butcher. There is a very cool etch on the blade, but also rust and pitting.

I decided not to preserve the original etch. Instead, I am going to...